If you glance around at this optical illusion by Akiyoshi Kitaoka, the snakelike coils around the outer edge will start to move.
But if you let your eyes come to a rest, the snakes come to a stop. Try looking toward one spot and 'spacing out.' Then start looking around again, and the snakes start moving.
Apparently, scientists have concluded, the illusion is somehow tied to eye movements.
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