I love this computer-generated series of graphics, apparently growing out of only 4kb of coding (via BoingBoing):
Close to the Potterrow Student Union facilities by Edinburgh University there is a section of wall hidden behind some carriageway between the Uni and the back of the National Museum on the other side of the road, mostly just boring concrete and breeze block, which is always covered in graffiti. It seems to be an unofficially official kind of spot for street art in that for years that plain, concrete section behind nicer old buildings has been allowed to remain a spot for street artists to cover. The graffiti on it constantly changes as one new set overpaints older stuff, so every now and then it is worth me having a quick walk past to see if there is anything new. Quite often, disappointingly, it is just large examples of lettering – not bad in itself, some done rather well, but I get rather bored from seeing piles of graffiti that is simply some big 3D lettering, I’d much rather see someone creating some visual art, like these two recent examples I noticed when walking past.