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88.9 MB (2.1 MB compressed)
5616 x 5532 pixels
47.5 x 46.7 cm ⏐ 18.7 x 18.4 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Peripheral drift illusion. When the image is viewed in the peripheral vision (indirectly, whilst looking outside of the pattern) it appears to rotate. When observed directly the movement stops. This phenomenon is not fully understood but it is believed that it may be partially a result of rapid intermittent eye movement, or saccade.
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