Archive
May, 2008 Monthly archive

One-way screw

One-way screws, such as the above (image from Designing Against Vandalism, ed. Jane Sykes, The Design Council, London, 1979) are an interesting alternative to the usual array of tamper-proof ‘security fasteners’ (which usually require a special tool to fit and remove). There’s a very interesting illustrated listing of different systems here.

A fastener requiring a special tool is effectively addressing the “Access, use or occupation based on user characteristics” target behaviour – and is functionally equivalent to a ‘what you have’ security system such as a padlock, except that anyone can look at almost any engineering catalogue and buy whatever special tools are needed to undo most security fasteners, pretty cheaply and easily, whereas it’s still a bit more difficult to obtain padlock master keys.

However, this kind of one-way clutch head screw, which can be tightened with a normal flat screwdriver, but is very difficult to undo using any tool (without destroying it) can be thought of as addressing a slightly different target behaviour: this is “No access, use or occupation, in a specific manner, by any user”. Even if the original installer wants to undo the screw, he or she can’t do it without destroying it (e.g. drilling it out). A few of the other systems illustrated on the Security Fasteners website also have this property:

Image from Securityfasteners.netImage from Securityfasteners.netImage from Securityfasteners.netImage from Securityfasteners.net

I’m particularly intrigued by the Shear Nuts and No Go enclosures (last two images above) – these two types effectively self-destruct/render themselves permanent as they are fixed into place. Something about this step-change in affordance fascinates me, but I’m not sure why exactly; it’s a similar idea to a computer program deleting itself, or Claude Shannon’s ‘Beautiful Machine’ existing only to switch itself off.

A step further would be a fastener or other device which (intentionally) destroys itself if the wrong tool (by implication an unauthorised user) tries to open/undo it, but which will undo perfectly well if the correct tool is used – along the lines of the cryptex in the Da Vinci Code, just as an ATM will retain a card if the wrong PIN is entered three times: it’s both tamper-evident and limits access. What other cryptex-style measures are there designed into products and systems?

Read More

Bitrex logo on slug pellets

Bitrex logo on slug pellets Bitrex, the world’s most bitter substance, is what’s known as a taste aversive – added to products which might seem tasty to humans (especially children) to persuade them not to drink them, or to spit out what they’ve already drunk. It’s a similar idea to the use of bitter coatings to break a fingernail-biting habit, although this would seem to involve some degree of operant conditioning/reinforcement compared to the (hopefully) one-off effect of Bitrex.

In design terms, we might class these kinds of aversives as blanket physiological design mechanisms – blanket because they affect all users (or at least do not deliberately discriminate against one particular class of user in the same way that the Mosquito does), and physiological because they are designed to leverage characteristics of the body’s responses to stimuli. A fire alarm intentionally loud enough to drive people out of an area would also fall under this category of blanket physiological mechanisms.

Neither are all such mechanisms aversive: the coercive atmospherics of using a “synthetic human pheromone designed to stimulate sales” in casinos (though the “extra oxygen” tactic is supposedly false) or even the smell of fresh bread in supermarkets are designed to encourage continued interaction.

Bitrex tasting

There’s a short but sweet bitter video of people tasting Bitrex here. Slug pellets are delicious, by the way, as long as you hold your nose*.

*Joke.

Read More

Ann Thorpe, author of the intriguing-sounding Designer’s Atlas of Sustainability – is pursuing an interesting investigation into design activism:

Some of the basic issues around design activism include:
# isn’t all design activism?
# how much design should be activist – aren’t designers supposed to be meeting client needs?
# are there best practices for design activism?

Low bridge, image by sarflondondunc
Low bridge in the Lee Valley, East London. Photo by sarflondondunc.

As part of this, she’s put together a very insightful article, well worth a read, Can artefacts be activists?, reviewing some of the different approaches in this area, from Langdon Winner’s discussion of Robert Moses’ low parkway bridges, to this very website:

…[O]nce designers are out of the picture, have moved on to the next job, can artifacts in themselves be activists? Can buildings, appliances, tools, or items of clothing, in themselves, lobby for change or even “force” it?

There are some worthwhile areas of debate explored in the article, especially the extent to which an artefact can embody power or discriminate, in itself, rather than simply mediating this through the way it is used or experienced. I appreciate this argument, but (coming from the point of view of a designer), I think the intent behind a design feature is critical to understanding the issue. If a bridge is intentionally made low to prevent buses passing underneath, this may well have the same practical effect as one which is simply low through an accident of history or topography, but it displays a very different attitude and philosophy on the part of the planners. Unintended consequences of design decisions – made long before products (/systems/environments) reach users – certainly have an enormous effect on almost all human-technology interactions, but not so many are actually deliberate. No design is neutral; all artefacts embody some intent, some philosophy, some outlook, even if it’s simply “manufacture this as cheaply as possible”. All design is rhetoric, a communication of values and intentions, and can be read as a social text if that’s the way you like to think of it, but with some design, those intentions are much more obviously expressed.

I look forward to seeing how Ann’s research develops – this is a very interesting area which should probably be given more attention in design school curricula in the years ahead. As more young designers “tire of designing landfill” (can’t remember if Ben Wilson first used this phrase to me, or me to him), design activism, of one form or another, is the most meaningful route forward.

Read More
Read More

I’ll be giving a brief seminar at Brunel on Tuesday 27th May, in advance of presenting at Persuasive 2008 – it’s a bit of a practice/rehearsal, to be honest…

Read More

A lot of architectures of control / design with intent examples are trying to enforce what I’ve termed ‘access, use or occupation based on user characteristics’. Not all designs are especially successful at achieving that target behaviour: users will not always be persuaded, or will find ways to avoid being coerced.

Mud, footpath, cycles and kissing gate

Bicycles can churn up the surface of footpaths…

Mud, footpath, cycles and kissing gate

…You can put up signs to tell cyclists not to do it…

Mud, footpath, cycles and kissing gate

…or you can put in gates (kissing gates as they’re known in the UK) to try to stop them (along with livestock)…

Mud, footpath, cycles and kissing gate

…but it doesn’t mean anyone will take any notice!

Read More

@danlockton

Error: Twitter did not respond. Please wait a few minutes and refresh this page.

Upcoming talks & events

I'm speaking or running workshops at:

Some of my previous presentations

Comments & trackbacks

  • Dan: Thanks so much Sebastian – that’s a much more detailed review than anything based on this is ever...
  • Putting people first: Read article Tweet Leave a Reply
  • Sebastian Deterding: Hi Dan, if this is the outcome of your Dublin workshop, I should definitely have attended it...
  • Sebastian Deterding: Great to see Johannes Zachrisson is moving forward :) .

Blog 2005-date