But wait – the gears are far from stationary, they actually work. The cogs of each gear fit into the slots on the top edge and bottom edge of the ring. When you press your finger against the top edge of the ring, the gears actually move and make a charming clicking sound that will sound, well, like a gear going around and around. This ring would be a particularly fantastic gift idea for an engineer, or someone who is fascinated with how things work. It’s also a great piece of jewelry for someone who typically doesn’t love jewelry.