Spirograph- was a toy made of plastic sawtooth circles pinned to a surface and wheels to circuit them. Using coloured biros to insert in the wheels holes to to turn the circles hundreds of times to create coloured patterns.
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The illusion is also known as the false spiral, or by its original name, the twisted cord illusion. The overlapping black arc segments appear to form a spiral; however, the arcs are a series of concentric circles.
OPTICAL ILLUSION ("Square Illusion"): It may look as if the two arms of the 'X' use different shades of pink, but in fact the whole X only uses a single color. _____________________________ Reposted by Dr. Veronica Lee, DNP (Depew/Buffalo, NY, US)