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20 universal feedback card
and smoking cessation
Can you take it apart and reassemble it to the original Football shape
The ultimate in Tangle artistic expression
12" diameter
Euler's Disk temp 20 universal feedback cardFascinating 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! Your
US$ 35.96
US$ 188.23
US$ 19.17