What you see here is the Image Fulgurator, a new, strange device that frankly scares me. It is the invention of a German man named—and you can't make this stuff us—Julius von Bismark. The contraption is designed so that one person can project "stealth" images into another person's photographs—images that can only be seen when the other person looks at his pictures. How can something like this be good? Why would anyone invent it?
The heart of the Fulgurator (Von Bismark says it mean "Flash Thrower") is an old manual Minolta SLR. A flashgun, mounted at the back, fires through the camera and through a transparency image on a roll of processed film inside. That image is then projected out through the lens and onto any surface.
The flashgun is triggered when another photographer standing nearby takes a picture using flash. Like a slave unit, the Fulgurator senses that flash and fires its own flash, projecting an image the other photographer's camera records. The image is projected so briefly, however, that the other photographer won't see it.
As this story points out, Fulgurator is simply a machine that allows a kind of analog hacking into other people's pictures. Von Bismark seems to believe it might be used in viral marketing and advertising. Maybe I'm just cranky, but I think the whole idea of this is obnoxious. –David Schonauer