Euler's Disk Physics Toy ▶ Gadgetify
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Toysmith Euler's Disk is a wonderful physics toy that puts on a trippy light & sound show as you give it a spin. It spins faster and longer as it goes. It comes with multiple films you can stick on it to see different patterns.
More optical illusion toys: • Rad Optical Illusion Toys
Euler's Disk demonstrates the physics of spinning and rolling. Simply spin it on the concave mirror to get started. As the spolling disk comes to rest, it makes a whirring sound of rapidly increasing frequency. You can read about the science here: https://en.wikipedia.org/wiki/Euler%2...
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