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Feature

Spin science into art
You won't believe your eyes or ears
Disk will spin faster and louder the longer it goes
Just give it a spin and gravity does the rest
A hypnotic display of light and sound
Patented 3" diameter chrome-plated steel disk
Creates a hypnotic display of light and sound as it rotates
Includes Disk, 9" concave mirror base and 9 pieces of holographic foil
Foil is magnetized

Description

Fascinating Desktop Illusions! Spin the holographic disk on the mirror. Does it speed up? Listen to its rhythmic sounds. Why does the humming get louder as the speed of the disk increases? This patented 3" diameter chrome-plated steel disk creates a hypnotic display of light and sound as it rotates. Includes Euler's Disk, 9" concave mirror base and nine pieces of magnetized holographic foil. Complete with instructions and the scientific answers!