This looks cool.

I bought my 2 year old nephew a few books with these things in. When you opened the page it slid the transparent layer over the lined layer made the wheels on the tractor etc turn. He thought they were magic books. Might have a go at making some of these myself!

Daz Studio 4.8 and 4.9beta, Blender 2.78, Sketchup, Poser Pro 2014 Game Dev SR5 on Windows 8 Pro x64. Poser Display Units are inches