One of my favourite games on the iPhone is Blueprint 3D. There's something I find endlessly enjoyable about rotating seemingly abstract shapes until they create something. The upcoming Shadowmatic by Triada Studios looks to take that idea and extend it to fully three dimensional objects casting shadows on the wall. The result, while a little mind-bending looks like an absolute winner.
Shadowmatic doesn't have a release date announced yet except for early 2014, so be sure to keep on the lookout. I know I will be!