Additional Info

• 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: REFERENCES: (PIRA 6J11.11)
• Videos-1: For further information on the Benham disk see tha Exploratorium site:
• Videos-2: including a template for the disc at: