Shadow clock

摘要

A shadow clock is provided which simulates a sundial by casting a shadow of a stylus created by relative movement between the stylus and one or more illuminated light sources to cast a shadow which moves across indicia on the face of a clock. In one embodiment, a triangular stylus is mounted to pivot about the center of the clock face and to cast a shadow of the stylus created by one of the illuminated light sources. The light sources are selectively illuminated when the stylus points to the number opposite each light source and projects a shadow of the stylus across the numbers as the stylus moves from a first number to a second number. Upon reaching the second number, the first light source is de-activated and the next light source which is now opposite the stylus is illuminated to cast a new shadow. In another embodiment, a single light source and stylus are mounted on a pivoted arm to cast a shadow of the stylus which moves progressively across indicia on a clock face. Alternatively, the light source may be stationary and only the stylus moves. In a further embodiment, a single light source and stylus move linearly along a clock face to cast a progressively moving shadow on indicia on the face. In a still further embodiment indicia moves along a linear path past a stationary shadow created by a stationary stylus and light source.