Here's the latest sculture from Brett Dickins, this one titled Butterfly Effect.
From the video description:
One off wooden/polished aluminum gear sculpture featuring a mechanical butterfly which takes a different flight path on each revolution of the main gear. Other features include small gears on the body of the butterfly which rotate, and the introduction of polished metals as a new material in my work.
Here is where you can see unedited footage of the Butterfly Effect sculpture