You would probably have little clue about the function of the Bullion Wall Clock the first time you set eyes on it. What you'll observe is a set of three small, stacked discs with curious perforations and a battery pack on the back. It's only once you have filled the fuel cell compartment, mounted the doodad on the wall with its magnetic fastener, and pressed it gently that you might realize what it does.
The outermost cylinder of Eric Wang's Bullion Wall Clock stays put and casts a ring of twelve evenly spaced spots out around it with red laser beams. The other two components are responsible for marking the hour and the minute, revolving at their respective rates and emitting a single pivoting point.