Additional Info

• ID Code: O1-32
• Purpose: Demonstrate the dark axle illusion.
• Description: A loop of metal rod is illuminated as it is rotated rapidly about a diameter. The vertical diameter of the loop appears to be darker than the rest of the area, which appears as a dimly lighted disc.
• Availability: Available
• References: REFERENCES: (PIRA unknown.) See Demonstration Reference File for information about this illusion.
• Loc codes: O1, D1, LS2