O3-21: BENHAM TOP
- ID Code: O3-21
- Purpose: Demonstrate perception of color due to periodic excitation of the eye.
- Description: A disc contains half black and half white fields with various sets of azimuthal black lines on the white field. Rotating the disc a few times per second creates circles which appear to have various mild coloration, from greens to browns to blues. Rotating in the opposite direction changes the colors.
- Availability: Available
- References: http://lecdem.physics.umd.edu/images/refs/refso.htm#O3-21
- Videos-1: https://www.exploratorium.edu/snacks/benhams-disk
- Videos-2: http://www.exploratorium.edu/snacks/benhams_disc_graph.html