The Fraser spiral illusion is an optical illusion that was first described by the British psychologist Sir James Fraser (1863–1936) in 1908. The illusion is also known as the false spiral, or by its original name, the twisted cord illusion.
The Fraser spiral illusion is an optical illusion that was first described by the British psychologist Sir James Fraser (1863–1936) in 1908. The illusion is also known as the false spiral, or by its original name, the twisted cord illusion.
Source: Wikipedia "Fraser spiral illusion" · CC BY-SA 4.0
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