[wbeaty]

A kid on Youtube invented the rotating version (scratching complete circles, then turning the plate.) Then an MIT student worked out a way to eliminate the second unwanted image; the pseudoscopic inside-out one. He gave talks on the techniques, find on youtube. Eventually he had an gallery show of his black, rotating scratch-holograms, and a few years later, was hired by various rock bands (and also Disney) to provide rotating scratch-holograms for vinyl re-issues of music. (But no need to remove the second image! That way you get one image down inside the black surface, a second one flying in the air above! Very spiffy and impressive.)

See Youtube playlist of scratch holograms.

https://www.youtube.com/playlist?list=PL60100E8F3572CEB1