As the second hand rotates around the face of this wall clock, the numbers continuously change from roman numerals to Arabic numbers. This illusion occurs because the cut-out overlay of stripes is moving clockwise over a specially prepared image. You’ll be drawn in as the white hour and minute hands contrast against the black and face of continuous movement. Battery operated. Clock measures 11.81" x 11.81" x 2.75". Plastic/black, white.