A clock is provided having a luminous digital display. The clock is enclosed in a housing having a glass covered display face. A stationary light source is provided within the housing. The first end of each of a plurality of optical fiber light conductors are mounted in annular concentric bands on a mounting board inside of the clock. The second end of each of the optical fiber light conductors are arranged in a pattern on the display face to indicate time. The light guides receive light from the light source and cause illumination of the display. Filters are mounted on arms which are in turn rotatably attached to the output shafts of a clock motor. The arms are disposed in such position that the filters come between the light source and the first ends of a group of light conductors as the filters rotate, filtering the light received by that group of conductors, and creating a colored display of time information at the second ends.A special arrangement of the light guides produces a simulated pendulum effect. An arrangement of a stationary filter disc in register with a rotating filter disc utilizes a vernier principle to allow use of a lesser number of output shafts of the clock motor. The display produced by the stationary and rotating discs is a moire pattern of light intensities which streaks across the time scale.