This is my favorite 4min selection of a larger work by Ralph Steiner. The original was silent, and the DVD had it set to classical music. I have swapped the audio for an electronica/industrial track by 3 Liquid Hz - Little Boy.
Favorite movements: @ 1:16 - counter mechanism @ 2:55 - normal gears, but cut to engage on diagonals @ 3:37 - SQUARE GEARS! @ 3:41 - variable speed transfer @ 3:46 - rotary to linear action with a 4 tooth cog
Several users have commented that these gears may be on display at The Museum of Science and Industry in Chicago, IL.