Optical toys: making drawings move using techniques based on optical toys

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Simple machines The wheel   Wheel and axle   Lever wedge   Swivel   Gears   Wheel and belt drive   Rollers   Block and pulley   Pivot   Springs Links: Spring 1 Spring 2   Caterpillar tread   Ratchet   Telescopic rods   Concertina   Switches Buttons and dials

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