One of my favorite past-times is unit or modular origami. I use it in my teaching, to decorate the house, and as way to while away time on planes, airplanes or wherever.
My Unit Origami hero is Tomoko Fuse and her books are my origami bibles.
The queen of Unit Origami, Tomoko Fuse
The queen of Unit Origami, Tomoko Fuse
To see what wikipedia has to say about unit origami/modular origami:
Out of print but an amazing resource: (I think you can buy used copies). Not too user friendly but for the determined, not too bad!
http://www.amazon.com/Unit-Origami-Multidimensional-Tomoko-Fuse/dp/0870408526/ref=sr_1_1?s=books&ie=UTF8&qid=1343343507&sr=1-1&keywords=unit+origami+multidimensional+transformations
Here's a fantastic web site by one of the great gurus of modern origami: Robert Lang.
Here's a fantastic web site by one of the great gurus of modern origami: Robert Lang.
Fascinating 16 minute TED talk about the field of Origami Engineering by Robert Lang--art, math and science--neat stuff!
