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| Demonstrates: Optical illusions. |
Description: Large wheel with lines that spiral in or out depending on the motor direction.
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Instructions:
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| Items Used: Notes: Put demo against white screen for best results. Math Description: None.
Size: 36" h x 24" w Condition: Good. Hazard: None.
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| Schematic:
None. Tech Specs:
None. Web Links: |
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| History: |
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