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 cogSeveral users have commented that these gears may be on display at The Museum of Science and Industry in Chicago, IL.