This is kinda hard to explain, but I've seen it several places before. I'm looking for a special way that two photographs are printed — they're printed so you from each angle can see just one of the two photos. It's printed on a load on triangles so if you're looking from 90 degrees you wouldn't really see anything, but from approximately 60 degrees and 120 degrees, you can see the two photos.
_________ / \ see photo two see photo one
I'm looking for the name of this printing style. I hope it's explained so you can understand it.