Just five short years ago I interviewed the magnificently-bearded Julius von Bismarck about his Image Fulgurator, a modified 35mm film SLR which would project an image onto whatever it was pointed at using a powerful flashgun. The gimmick was that the device was triggered by the flashes of innocent tourist sheep as they flocked to famous monuments and snapped point-and-shoot pictures.
Invisible to the human eye, Julius’s various pictures and messages would be marked indelibly onto the pixels of these tourist photos. The fact that the Fulgurator looked like a gun just made the whole thing cooler.
Now, there’s a version you can buy. It comes from the folks at DIY Photography, and it’s called the Light Blaster.