"Algorithms are already looking through the viewfinder alongside with you: they adjust settings, scan faces and take a photo when you smile. What if your grin wasn't the only thing they cared about?
Camera Restricta is a speculative design of a new kind of camera. It locates itself via GPS and searches online for photos that have been geotagged nearby.
If the camera decides that too many photos have been taken at your location, it retracts the shutter and blocks the viewfinder. You can't take any more pictures here."
(via Kottke and elsewhere)