We have covered a number of awesome kinetic sculptures here in the past. You can even buy some of them as a desk toy. Take the Balancing Act Kinetic Sculpture for instance. It has a unique design and makes a great desk toy. The sculpture is hand-forged and will not be duplicated design-wise. It is 7″ wide and 11″ tall. Another awesome toy you can pick up on Etsy.
[Get it from KylesKinetics]