> You know those kids' books that have the bumpy plastic coating and when you turn the book one way you see one image - look at it from a different angle and yo

> You know those kids' books that have the bumpy plastic coating and when you turn the book one way you see one image - look at it from a different angle and you see another image? fyi: https://en.m.wikipedia.org/wiki/Lenticular_lens https://en.m.wikipedia.org/wiki/Lenticular_lens