Soundbombs: Strange little things
"Soundbombs are New-Media-Accessories. Each one a lowtech object for interactive transmission. An integrated soundmodul makes it possible to record any given sound and then activate it through a motiondetector. As a Non-Visual Graffiti, with its origin in streetart, Soundbombs give the possibility to tag a place in an accoustic form: a welcoming greeting at the entrance or a warning of a bad restaurant. Each owner can leave a personal message anywhere and at any time. Soundbombs can whistle, laugh, belch or recite a poem."
Now, that's an unique idea.