Remember those cool lenticular
images, back in the days before holograms and Magic Eye
posters? Well I do. Lenticular images use a special plastic cover (sorta like a bunch of prisms on a page) to show your eye one of two or three images on one page. Usually they simulate a limited 3d effect, or show simple animations. My daughter has a Disney Princess cup with lenticular printing on it. There are only a couple of programs out there that'll ease the generation of lenticular images, and most are pretty pricey. Luckily the open source community has (once again) tried their hand at a tool: Lentikit
. It's a Java application for creating and adjusting lenticular images. Lenticular screens not included. Unfortunately, Lentikit has a long way to go, but it's open source, so feel free to help the lone developer out if you think it's cool.