A blind camera
Buttons by Sascha Pohflepp is a “camera” without a viewfinder or a lens. Instead of taking a picture as you press the button, it shows you the last image shared by someone else on Flicker.

I think this idea is really great, but also quite disturbing. It should make you think one more time what you can do to personalize an image before taking it.
When I first heard about this camera at Siggraph, I thought the camera was a little more advanced, and that it contained a GPS allowing it to seek out an image taken from the location you are at, at more or less the same time of day in the past.
