Page 1 of Spiky Potatoes and Bus Stops

Was sitting on the top deck of the bus and noticed what can best be described as a potato with cocktail sticks sticking out of it on the tops of several bus stops - anyone else noticed these ? or have any clue what its all about ?

Been around for a couple of years so some of them must be pretty green by now

http://kudocities.com/cities/london/conversations/bus-stop-potato-art-spiky-spuds-on-east-london-buses

http://www.guardian.co.uk/artanddesign/2007/may/07/art