An award-winning interactive book and one of the most advanced when I came out (in 2011).
It uses OpenGL 2D, 3D and physics.
Elastico – Andersen Award 2015 for digital creations BEST BOOK for IPAD 2011 App Store Rewind Italia -demo app loaded on iPads displayed in official Apple stores around the world – BEST Italian APP 2011 iPad

App Store link
Official site link