Lenticular technology -kids books

My 4th daughter found an amazing 'moving' book from the library. You move the book and the pictures changes; seems to be moving. I remember gettting these kinds of things in the popcorn; little cards and the picture would change when you moved them. These pictures don't change into a different item but change positions. My daughter just loves these books, so far they only seemed to have produced two in the series. If your kids are getting bored of the same old-same old then get your hands on these.