Aspiral Clock by Will Aspinall and Neil Lambeth

Aspiral Clock is a work of London, UK based inventors Will Aspinall and Neil Lambeth. Aspiral Clock uses a spiral instead of a dial, and a ball instead of hands. The spiral face turns slowly over twelve hours. At the 12th hour the ball drops through the hole in the middle and start over its journey at the bottom.

Source: Aspiral Clock