This beautiful machine made by Roland Waters is well-document in the video shown here. The number of different mechanisms packed into such small space is extraordinary. The gear-based ring elevator is amazing, as is the rate of feed.
From the YouTube description:
This is intended to be an awkward, overly complicated mechanism for the sole purpose of entertainment and to make noise in the process. People seem to enjoy watching gears turn and marbles running around in circles making noise. There are 16 gears hand-cut from 1/2" Baltic Birch plywood driven by an electric gear reduction motor.
Here's the original post from Spiel und Kunst mit Mechanik.