ILLUSIONS & IMPOSSIBLE FIGURES
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    Fraser spiral

    Fraser spiral
    A distortion illusion in which overlapping black arc segments appear to form a spiral but are in reality a series of overlapping concentric circles. To demonstrate this, simply follow one of the curves around with your finger. The illusion is named after the British psychologist James Fraser (1863­1936) who first published it in 1908.1


    Reference
    1. Fraser, James. "A new visual illusion of direction." British Journal of Psychology, 2: 307-337 (1908).

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