Shapes seem to move when you look at them because your eyes and brain are working together like a team. If you look at a pattern on a wall or in a book, your eyes might flicker slightly as they try to focus, making the shapes appear to wiggle or flow. It’s kind of like how a still picture looks like it's moving when you blink!
Examples
- Looking at lines on a white wall seems to make them wiggle.
- Walking past a tiled floor can cause tiles to seem like they're moving.
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See also
- Why Do Shapes Appear When You Squint at the Sky?
- Why Do Shapes Appear When You Blink?
- Who is Ponzo Illusion?
- How optical illusions trick your brain - Nathan S. Jacobs?
- What Causes the 'Kiss Illusion'?