Camera Restricta is a speculative camera design by Philipp Schmitt that won’t allow you to take photos if too many have already been taken by others at that location.
On the other hand, I sometimes have the chance, and then the responsibility of course, to take the last photo of a place before the shutter retracts permanently. Or maybe even the first photo of a place, where no photos have been taken yet. This is then guaranteed to be a truly unique capture.
It would be cool to pair this with a service that automatically deposits not-taken photos of heavily photographed places you visit into your account, i.e. when Camera Restricta won’t let you take a picture of the Eiffel Tower, a photo of it found online and taken from your exact location would be placed in your Dropbox photos folder. (via @bdeskin)