when I was young I had one of these books of hologram(actually it's called stereogram), there's actually two ways of doing it, a parallel way and a cross sighted way. (hard to explain without a diagram though!)
it amused me for a long long time!
example:
you have to intentionally put the image out of focus, things will appear as double vision, they will shift places horizontally and when two eggs/lizards overlap, you'll see a 3 D image.
it amused me for a long long time!
example:
you have to intentionally put the image out of focus, things will appear as double vision, they will shift places horizontally and when two eggs/lizards overlap, you'll see a 3 D image.