By Stephen Hamacek.
A kinetic sculpture inspired by marble machines, marble madness and classic Sesame Street, with a little steampunk flavour :) Created as a Uni assessment piece.
See the animation at https://youtu.be/5LC8PYq_VS0
and more info/discussion at http://blenderartists.org/forum/private.php?do=showpm&pmid=665747
Several amazing procedural wood shaders are by Dale Cieslak, available on Blendswap