On the sweet spot of the urinal, slightly to the left of the plughole, there is a picture of a bluebottle, under the glaze. Of course, being men, everyone tries to pee on the bluebottle, causing less mess all round. And, naturally, it works! I think the idea is to get people to do what the government decides is good for them by subliminal methods. The discussion, which I soon fell asleep in, was whether that was ethical.
Personally, I’d rather people acted out of conviction than as a result of manipulation. That means being informed by information and intelligent debate – and not falling asleep in the middle! Maybe there’s also a place for story-telling, such as parables and anecdotes of real life. They lodge in the memory better, like insects on a sticky fly-paper.