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Why can a still picture seem to move?

The “rotating snakes” image can seem to turn even though its pixels stay still. Its repeated brightness pattern interacts with a visual system that does not remain perfectly motionless while looking. Eye-tracking research helps test which changes in the eyes accompany the illusion, while differences between viewers remind us that the effect is not guaranteed.

3–7 min

Questions you could explore

  • What would a useful control image change while keeping the rest of the pattern the same?
  • How might eye movements affect the motion experienced in a stationary pattern?

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Why can a still picture seem to move? | Speech Topic | speaking.app