WORKTECH Sydney Coming Up

I’ll be at WORKTECH19 Sydney on Thursday 21 February – will I see you there?

From time to time, there are certain perks to being a blogger – one of which is the chance to convince people that you do know something about what you do, and you’d be a great person to help them out promoting your event.  While I do this on a regular basis for BILT (which actually probably involves more hard work than perks), occasionally other opportunities arise such as being a Social Media Ambassador for WORKTECH. 

I’ve been attending WORKTECH for a number of years (maybe since they first started their event in Australia actually) and this is the second year I’ll be there tweeting away in my capacity of social media ambassador.

Personally I’m really looking forwards to Dr Nelly Ben Hayoun as a speaker you wouldn’t get to see here in Australia often who is doing some really interesting work at the intersection of design, technology (and everything else really).  Hopefully I’ll have some great inspiration for some new blog posts too.

Here is a link to the full programme, sessions include:

  • BCG Create An Office Of The Future In Hudson Yards, New York | Ross Love, Senior Advisor, Office of the Chairman at Minderoo; Ex- Managing Partner for Boston Consulting Group New York
  • Super-Experience Designing For Talent In The Digital Workplace | WORKTECH Academy & Mirvac
  • The Art and Science of Murmuration: Burning Man’s Culture of Cooperative Leadership | Stuart Mangrum, Education Director, Burning Man Project
  • B:Hive – New Zealand’s Largest And Smartest Co-Working Space | James Grose, CEO, BVN; Greg Smales, Director, Smales Farm
  • Gen Z Workplace | Natalie Slessor, General Manager, Workplace & Change, Lendlease
  • What Is This Tsunami Of Data Arriving From My Buildings Telling Me About How To Save Money?! | John MacLeod, Internet of Things Specialist, IBM
  • A MONSTER AT WORK | Dr. Nelly Ben Hayoun, Designer of Extreme Experiences, NBH Studios | Sponsored by Mirvac
  • Crossing The Threshold – The Sustainable Digitalisation Of Work And Real Estate | Simon Carter, Director, Morphosis | RICS & Morphosis
  • The Sentient Workplace | Philip Ross, Futurologist & CEO, Cordless Group & UNWORK
  • Designing for Fashion David Jones & Country Road Group – Case Study | Heidi Smith, Partner, Gray Puksand

If you are interested in future of workplace, people, culture and technology – then this is a great event to attend. Here is the link to register to WORKTECH Lounge Wednesday 20th February & WORKTECH Conference Thursday 21st February.  I hope to catch up with you there!

If you are interested in the event but not based in Australia, check out Unwired’s website as they hold similar events all over the world.

Ceilidh Higgins

Does your workplace offer yoga, meditation or perhaps colouring in?

Meditation by Moyan_Brenn, on FlickrWhilst many are touting workplace wellness as the next big thing in workplace design and strategy, there are others such as Kelly Robinson, workplace manager and yoga teacher, who spoke at last month’s Worktech Melbourne, who are suggesting more specifically that mindfulness practices will soon be coming to your workplace – if they haven’t already. The signs are certainly out there that mindfulness has suddenly become a topic of interest with many blogs and articles on workplace design and human resources sites as well as at least 2 books on the subject. Since I saw Kelly speak last month, I have seen a number of articles on mindfulness practices and spaces within the workplace, and this article which I shared recently on Linkedin seemed to have a high response rate, suggesting that people are certainly interested in the topic.

For those of you who already practice yoga, meditation or just spend to much time around psychologists, you certainly would have heard of mindfulness. If you haven’t perhaps you are wondering what is it – and how does it relate to the workspace – and probably all of you are wondering what on earth does colouring in have to do with it? According to Google mindfulness is “a mental state achieved by focusing one’s awareness on the present moment, while calmly acknowledging and accepting one’s feelings, thoughts, and bodily sensations, used as a therapeutic technique”. It has become a commonly used treatment technique by psychologists, and essentially involves beingaware you in the present moment and of your surroundings and calming the breathing and the mind. Whilst meditation is a common path to mindfulness, sitting cross legged on the floor and doing nothing is not the only way to achieve a state of mindfulness. There are many different kinds of meditation.  Yoga can be one way of calming the mind, as can breathing techniques, sitting or walking in nature and apparently colouring in! (or other focused but slightly repetitive activities where you think about what you are doing) This week I came across this article on how big corporates are issuing adult colouring books to staff as a means of mindfulness training.

Whilst practices such as yoga and meditation have been growing in popularity in recent years, why are corporate workplaces offering these programs? Whilst its certainly true that many corporations like to promote how much they care for the health and wellbeing of employees, science is showing there are of lot of potential benefits for employers as well as their staff in mindfulness training. Numerous studies have shown that within weeks of commencing a meditation program, changes in the structure of the brain can be seen on an ECG. According to Headspace, a mindfulness and meditation app that promotes itself as ‘a gym for the mind’, mindfulness promotes creativity, increases focus and reduces stress and anxiety. In the workplace, all of this could mean both increased productivity and happier staff. With this research now becoming common and mainstream, a spate of recent reports on Forbes, the Huffington Post and the Wall Street Journal all discuss the science and benefits of mindfulness in the workplace. Whilst many of these recent articles relate specifically to mindfulness in the workplace and David Gelles’s new book “Mindful Work”, there is a long and growing body of studies related to meditation (see for examples recent article on Forbes and Wikipedia) and mindfulness showing similar benefits.  And of course with any new trend, the articles against mindfulness are also starting to appear.  There was one I read, which suggested forcing people to meditate in a group setting would be more harmful than helpful to your workplace culture – I must say I hadn’t even thought of the idea that anyone would try to force people to meditate!

I have been practicing yoga and mediation for almost 4 years, and would personally agree with many of the benefits – and I note I would have hated to be forced to meditate in a workplace setting. I believe yoga and mediation have helped me to become more resilient and deal better with a number of signficnt workplace issues in a previous workplace from bullying to chronic pain and then a redundancy, to now being better able to managing my stress , prioritise better and focus more on what is important both in life and at work. I think my practice has also helped me to become a better team leader and a better designer, through increased awareness of how I communicate with others as well as creating a calmer mind which I can see affecting my creativity and ability to think differently. Frequently I find after a yoga class I will have new solutions or ideas related to current projects – the basis of this whole blog in fact started in my mind during a week long yoga intensive.

I have also seen how introducing these practices to the workplace, opens up yoga or meditation to people who might not otherwise venture into a yoga studio or a buddist meditation class. I used to sit in a workstation pod with 4 male structural engineers of varying ages – our workplace introduced a weekly yoga class, and over time all of them become participants, regular discussions were held in our work area about the benefits of yoga and there was a push for the classes to be increased to twice weekly. They also frequently commented on how it was obvious I was in a better mood on days when I attended yoga classes before work.

How does mindfulness affect workplace design though? If its just about quieting our minds, can the design of our workplaces contribute? They certainly can, and it doesn’t have to be all about cushions or incense. The recent article by Leigh Stringer for Office Insight  suggests a number of ways mediation spaces can be created – from dedicated rooms, to quiet spaces away from the busier parts of the workplace, to outdoor spaces and labyrinths for walking meditations. Space for yoga and other physical practices is frequently accommodated within flexible meeting or training spaces. In many ways, good workplace design supports mindfulness – a variety of different spaces for different uses, access to nature or views of nature and provision of quiet soothing spaces for individual use all support work, just as much as they support the practice of mindfulness training in the workplace. Good design itself also helps focus us in the here and now rather than wishing ourselves elsewhere.

What other ways could design promote mindfulness? Does your workplace offer yoga, meditation or colouring in? If it did, would you participate?

Ceilidh Higgins

Image Credits:

Is a Well building different to a Green building?

Sick by Leonid Mamchenkov, on FlickrRecently I attended Worktech  Melbourne, where many of the speakers focused on wellness (or  health and wellbeing) which seems to have become the next big thing in workplace design. Australia is about to have its first certified “well” building, the new Macquarie Bank building at 50 Martin Place.

When Tony Armstrong from CBRE mentioned this concept of a certified “well” building, and that it had been around since 2013 (with CBRE’S global headquarters actually having being first certified WELL workplace) I wondered why I hadn’t heard of this building assessment tool before. I keep pretty up to date with what is happening in both the world of workspace and of green buildings, and this concept of a well building certification seemed like something that would have grabbed my attention before. Someone suggested maybe it was the Living Building challenge rebranded (it’s not). Whilst the WELL building standard may have been around for a little while, it’s been a pilot (version 1 was just released in February 2015) and there are so far only a small number of WELL certified spaces (coincidentally I have been to one of the restraunts registered for certification in Chicago).

So what is a WELL building? According to the website of the International Well Building Institute, who developed the WELL Building Standard “Buildings should be developed with humans at the centre of design.”  Interestingly this sounds almost the same as TILT Studio’s concept for codesign, who also spoke at Worktech (and is fresh in my mind because I have just been reading their book Codesign).

A WELL building is more than just human centred design – a WELL building sounds pretty amazing actually. The Well Building Institute claims not only will a WELL space improve our health, nutrition and fitness, but also our mood and our sleep patterns. And of course our improve our performance. There have long been claims that a well (as in good!) designed building, in particular workplace increases productivity, which one assumes equates to increased performance. From my own experience as a designer,it’s clear to me how buildings can help or hinder the activities within. Buildings improving mood also makes send to me – stimulating design, natual light and sufficient ventilation all play a part in enhancing our mood. But how can our buildings help improve sleep? Or nutrition? Clearly I need to learn more about what a WELL building might be.

So this week I set out to undertake some research on the WELL Building standard to see what it entails and how it differs from and compliments a green building (I should mention that the WELL Building certification is administered by the GBCI who certify LEED).  When I started reading the WELL concepts (or categories) it sounds a lot like GreenStar (Australia’s equivalent to LEED) – air, water, comfort… nourishment and fitness are a bit different. WELL has 7 categories (called concepts) are air, water, light, nourishment, fitness, comfort and mind. Like GreenStar these categories are then broken down into features (a total of 102). Some features are baseline essentials for certification and some are optional for extra points and a higher level certification. Also like GreenStar some features relate to the built fabric and some are management, policy or education strategies.

Air – this category is all about indoor air quality so is very similar to what you would expect for a green building.

Water – green buildings tend to focus on water use, WELL is all about water quality.

Nourishment – I am going to quote this one because I am not even quite sure what it might mean yet. “Implement design, technology and knowledge building strategies to encourage healthy eating habits. Provides occupants with design features, behavioral cues, healthy options and knowledge to enable healthier food choices”!!!! How will my building do all that? More research required on this element for sure!

Light – this seems a little more straight forward. It’s all about appropriate light and enough natural light. I can see how lighting can impact health, so many people complain about headaches and muscle tension related to poor lighting. Daylight also regulates our mood and sleep patterns so maybe his is how well buildings help improve our mode and sleep?

Fitness – is about introducing opportunities for occupants to excercise. So I expect this category will include features such as gyms but also design strageties that encourage using stairs over the lifts.

Comfort – again this is someone similar to some similar GreenStar credits. Acoustics and thermal confort a key to providing a “soothing, distraction free environment”.

Mind – this is another category I want to research further. Here we are looking to support mental and emotional health, relaxation spaces are important but so is “providing feedback and knowledge about their personal and occupational environment”. What does that mean?

Obviously to understand the tool and what it means for the design of buildings I need to do a bit more reading (all the above was gleaned from the overview sections of the website). Next step download the standard.

One difference I notice immeadiately on reviewing the executive summary is that “the space must undergo a process that includes an onsite assessment and performance testing by a third- party” – this sounds interesting someone must actually visit the building – and is not required for a GreenStar certification. The assessor will spend up to 3 days onsite undertaking tests and verifying features applied for. This is pretty stringent and I imagine comes at a cost (Certification is charged by the square foot, prices are on the website).

The program allows for certification only of completed occupied spaces. Buildings yet to be tenanted cannot be certified, only designed as WELLL compliant. Like GreenStar or LEED there are levels ranging from silver to platinum. WELL is being designed for many building types, although at this point is mainly aimed at office and institutional projects. Other project types (retail, residential, healthcare and more) are encouraged to register and help develop the pilot programs.

Like GreenStar has recently introduced, certification has a validity period of 3 years after which time, it must be re-verified and certified again.

If you are familiar with LEED, the standard has a comparison table identifying how the WELL features relate and cross over with LEED.

At this point I decided to read up on the nutrition and mind sections of the standard as these are the areas that I feel I have the least understanding of how design could affect space occupants in these areas. So I am by no means an expert on the standard yet!

Unsurprisingly a large part of the nourishment section relates to food and drinks provided or sold by or under contract with the project owner. So if I wanted to have a WELL certified shopping mall and my food outlets would have to meet pretty specific items around fruit, vegetables, fat and sugar as well as serving sizes and labeling. I’d say it would be simpler for a workplace which would tend to provide less food to employees. Hand washing is a feature where design plays a part – provision of disposable paper towels and soap at all sinks as well as minimum sink sizes are required for this feature. Under another feature, food preparation area require separate sinks to prevent cross contamination. (I wonder if a workplace breakout counts as there wouldn’t usually be raw meat there?) There are some specific requirements for refrigerators which might be selected by a designer. The main areas where nourishment features are impacted by design would be the provision of gardening space and spaces for mindful eating, both of which are optional features. Mindful eating is the provision of breakout areas as unsurprisingly getting away from out desks is good for reducing stress, and apparently eating with others encourages healthier eating. The eating space must have fridges, microwaves, sinks etc and contain tables and chairs to accommodate at least 25% of total employees at a given time as well as be located within 60 m [200 ft] of at least 90% of occupants. The new GreenStar interiors tool also requires breakout space, with an area based calculation per occupant and less definition of what the space contains – the GreenStar credit is about providing staff for employee enjoyment as opposed to specially a space for eating (it can be part of an activity based work area)

The mind concept is much more diverse. Covering biophilia, workplace policies in travel and flexible working, charity, beauty, the design process and post occupancy evaluations. Some features would be perhaps difficult to demonstrate objectively – how do we measure if the project contains features intended for human delight and celebration of the spirit? (This feature is apparently derived for the Living Buildings Challenge). The feature related to adaptable spaces and requirements for both diverse spaces for collaboration and private spaces for concentration could start to provide a good guide to the amounts and types of private spaces required within workplaces when clients start pushing design teams to cram in more workstations. Not sure the sleep pods and meditation cushions will take off just yet though! Inclusion of plants has already seen a big increase in Australia due to GreenStar, and forms part of the biophilia features along with patterning from nature, water features and roof top gardens. Other design oriented elements include minimum ceiling heights and the inclusion of artworks.  This mind section would be worthwhile for designers to take into account even when not designing specifically to meet the standard.

Having reviewed in more detail two of the seven concepts, only around one third are design related. Clearly certification under the WELL building standard requires a high level of commitment from management and will have far reaching effects on the organisation and it’s employees and building occupants. The question is who will drive adoption of this standard – whilst design teams can educate their clients as to its existence, I think ultimately it will have to be driven from within an organisation’s leadership team for there to be any chance of sucess. Perhaps also we will soon be finding a new consultant on our team, a wellness consultant who might have a background in HR or psychology rather than in buildings. Personally I believe, this could only be a good outcome for workplace design. What do you think? Can design contribute more to health and wellbeing? Will your own or your client organisations be interested and committed to this process? Would you like to have a wellness consultant on your team?

Ceilidh Higgins

Image Credits:

Worktech Melbourne: Let the User Decide

847622286_b1a0789077_oIf you think about all the images you have ever seen of a Google office, you will realise that very few of them picture any desks – ball pits, slippery sides, cars turned into meeting rooms, sleep pods, gardens, game rooms, footsal tables, and of course kitchens full of free food – but not very many desks.  So it may come of some surprise to learn that at Google, each Googler (they really do seem to call themselves googlers) has their own desk. When Hayden Perkin spoke about the design process for Googles New York City offices,  at last months Worktech Melbourne most of the attendees at the event hadn’t been expecting to hear that Google still has allocated desking.

Hayden’s presentation focussed on the importance of the philosophy of “Let the User Decide” particularly in the design of the actual workpoints.  Let the Users Decide is part of the Google workplace design guidelines – which can be described more as a Google vibe than a strict set of standards with limited options.  As part of the Google NYC office project consultation the googlers were asked about what style of workpoints they wanted – and around half were in favour of enclosed offices! This certainly surprised an Australian audience, as even in our most conservative client offices (outside of legal) cubicles are almost considered outdated and the idea of 50 percent of staff having an office would be unheard of for quite a while.

Enclosed and assigned office space is only really suited to very static work environments with very little change in organisation size and structure, teams and small movement of people. The way that Google works needs this flexibility. Typically googlers work in teams at workpoints that are assigned for the duration of projects. Movement and reconfiguration of people and space are frequent – on average people move 4 times per year. So, while we can let the users have input, in this case not all the users got what they wanted – exactly. Given that the other half wanted open plan work environments, Google made  the decision that the open plan environment would suit their operational needs better.  But Google wasn’t quite done with the user input to design.

Taking the user involvement further than your typical consultation sessions, Google determined to allow the users to custom design their open plan environments. So while you couldn’t necessarily have an enclosed office, you could make choices such as how high the screens are or what type of desk layout or accessories you have at your workpoint. Google worked with Haworth to design a workstation system that allowed the users maximum control over their own micro environment, and that looks something like a desk sized meccano set. The system is based upon a post and beam system, with worktops, screens and accessories to attach. The attachments are made via coloured connectors (google colours of course). Hayden described the system as “controlled chaos”.

Within a certain set of rules (for example different carpet colours delineate fire egress paths that must be kept open) each team got together to plan their own defined workzone. The groups have come up with many different solutions and have used the components to build not only workstations, but semi enclosed office areas, park benches, canopies and toys. Some people were not interested in building their own desks and Google now offers a selection of standard models for these individuals or groups.

The result is certainly not at all a designed aesthetic, this is saved for the cafes, libraries and nap areas – those images of a Google office with which we are all familiar, still exist as part of the NYC office, but were not the theme of Hayden’s presentation. As an interior designer, I’m still not sure how I feel about this level of user design and customisation. The flexibility and choice it gives to the user groups is fantastic and I’m sure this allows Google to make more googlers happy with their own work environments. It certianly also works in an environment where teams are constantly moving and reforming.  As a designer, I would also certainly love to never have a discussion about workstation screen heights ever again.

Visually however its not the sort of environment that I like to work in. That said, I also know that within days or weeks of the client moving in, any office environment can quickly turn into the same level of controlled chaos. I’ve never quite figured out if its just rules or also culture, but even the most uncluttered aesthetically designed office environment can quickly descend into something else entirely. Archive boxes build up around desks, collections of trolls pop up on top of partitions or other paraphernalia starts to take over the office (I had one previous boss that insisted upon keeping dusty models of some of Sydney’s most hideous buildings) and then the controlled chaos is not really much different to that of the create your own work point office.

I guess this point brings me back to one of the biggest issues of workplace design and user consultation – it doesn’t matter if your workplace is fixed seating or an agile workplace. Choice, customisation, control and personalisation are big issues for the workplace occupants. They are issues that don’t easily mesh with the visual control of interior design or the flexibility of standardised corporate space allocations. So the question which applies equally to interior designers and those within client organisations responsible for procuring workplace design (whether facilities or project management, human resources or finance), how much do you let your users decide?

PS. Come Out to (Midnight) Lunch – If you are in Sydney (or will be on Friday 11 April), I have decided to organise an opportunity for followers of this blog to meet and network.  If you are interested in having a drink, meeting new people and talking with fellow The Midnight Lunch followers about workplace, interior design, architecture, BIM or collaboration in our industry – come to Chicane Bar at 10-20 Bond St in the city from 5.30pm on 11 April.  (Note: This is not a sponsered event, so you will have to buy your own drinks and food!)

Image Credits
Creative Commons Attribution-Noncommercial-Share Alike 2.0 Generic License  by  TitaniumDreads 

Worktech Melbourne: Jellybean Working

Yummy Jelly Beans by Ruth L, on FlickrLast week I headed down to Melbourne for Worktech 2014 . It is the first time I have attended a Worktech event , going based upon a few great recommendations – I had been told it was the best workplace event in Australia. I wasn’t disappointed. As well as getting a peak inside of NAB’s new 700 Bourke St at Docklands (which was the event venue) the presentations were generally of a very high standard – great presenters with relevant and focussed material. I also found it interesting to note that most of the presenters were not designers – but representing the client organsiations such as NAB, Bupa, Google, MLC and RMIT to mention a few – which sets the apart from many other workplace seminars. The day was jam packed – there were approximately 15 sessions, as well as the presentations these included a site tour and an interactive session moderated by Rosemary Kirkby. I thought rather than give you a sentence or 2 about all of them I’m going to share my thoughts on the 2 sessions I found most interesting , over this post and the next. If you see other sessions in the program and wonder what they were about – feel free to comment, tweet or email me and I am happy to share further thoughts.

Philip Ross is a workplace futurologist at Ungroup, and so not surprisingly, he was talking about the future of the work in a presentation which he described as being about Jellybean Working. At first I wondered what the reference to jellybeans might mean, surely not the fad for jellybean shaped desks, but as I got interested in his talk the reference to jellybeans faded into the background. Although he did explain towards the end, and so will I. The main focus of Philip’s presentation was the impact that technology would have on the workplace of the future – and not a far range future, but within the next few years, technology that already exists. Whilst we are all now familiar with the idea that we work using technology tools – and that they change and update all the time, I would say less of the audience were aware of the technologies that makes up what Philip described as the next break through in the workplace – big data and real time activity tracking.

Philip spoke about a range of technologies and methods for tracking activity both in the workplace and elsewhere including sociometric badging, social media and short range wireless as well as other technologies such as driverless cars which would change the way we work.

Sociometric badging is an area I have been interested in since I first came across it about 12 months ago. MIT have invented a device, which they call the sociometric badge which allows you to record data about the movement and behaviour of the person wearing the badge as they move around the workspace during the day. The device is about the size of security swipe card (and can have this function embedded into it I recollect) and it contains a whole bunch of bluetooth and/or wireless sensors, motion detectors and recording devices. So not only will it track where you walk, but if you are standing or sitting and if you are talking to someone and how loudly for how long. Put very simply and crudely, through a whole lot of measures, the data then indicates who you talk to a lot, who you say hello to in passing and where and how you spend your day. The data can then be used to create social maps of an organsiation, which are now being considered important signifiers of innovation and collaboration. I could probably write a whole blog post on this topic…If you are interested in reading more, I highly recommend “People Analytics: How Social Sensing Technology Will Transform Business and What It Tells Us about the Future of Work” by Ben Waber.

As Philip pointed out, all of this leads to the question of privacy. However studies are showing that privacy is very much a generational idea, and that generally younger generations have less concerns with sharing information than older generations. Many people seem to no longer care about privacy at all – Philip referred to a website ijustmadelove (which I am not linking to my blog – I don’t want to think about how much spam it might set off!) where people are choosing to share very private information. Whilst some information we are sharing by choice, other information is shared without most of us realising it. We are already sharing significant amounts of information with search engines and retailers, and not just online but a link between instore and online.

Using short range wifi to allow checking into a locations via a social media application means that the next time you enter that space the retailer will know every time you are inside their store. They will also have your purchase history and your browsing history while in store. This will lead to live time direct advertising. Apple are also already using a low energy bluetooth system called iBeacon which doesn’t even require you to check in. I already have something like this happening on my phone which I think is operating via gps tracking – every time I pass the local burrito place after using an evoucher there – at this point it doesn’t offer me any deals but it does pop up to tell me I am near the restaurant.

All of this eventually leads us eventually back to the jellybean. Philip uses the term jellybean to refer to the social media dot or blob that indicates if you are online or offline. He suggests this will become more important in the workplace, signaling to others where you are and what you are working on. I know in an office I worked in with an instant message network people did stop calling the phones if your greet dot wasn’t on. However in the fairly near future, not only will this social media icon just signify that you are online, the technology to concurrently edit documents with other users, will also allow it to signify who is working on a document, whilst tracking technology will identify where in space they are physically located. Philip defines “Jellybean working” as the intersection of technology, people and physical space.

All of this freaks people out a little sometimes, but if you think about it, Apple and Google probably know everything about you already. Which is a nice segway into my next weeks blog post, which will be on Hayden Perkins presentation about NYC Google and Let the User Decide.

Would you sign up for a sociometric badge in your workplace? What new technologies or social media platforms do you think will transform the way we work? Do you use social media in your workplace?

P.S. I’m excited to announce that I’ll be presenting at RTC NA in Chicago in June in a session on a similar topic to this one – entitled BIMx:Big Ideas around Big Data. Registration for the conference hasn’t opened yet, but the RTC AUS conference registration has, it will be on in May in Melbourne and I am also presenting there – a session called Get your Groupon. Check out the RTC Events Site.

Image Credits:

Creative Commons Attribution-No Derivative Works 2.0 Generic License  by  Ruth L