shadow clock / Clock

Shadow clock such as the sundial. It is a device that measures time by the position of the light ( like sun ). As the light moves follow the path, the shadow-edge aligns with different angle. The light sets different height that make different shadow of length.

The light casts shadow from its style onto a surface marked indicating the hours of the day. The shadow is the time of the gnomon. short shadow is the hour hand, and long shadow is minute hand. It works by light just like the ancient use sundial. How simple and nature.