Blinking can make you see shapes because your eyes change focus really fast. When you blink, sometimes the light that enters your eye gets a little jumbled, and your brain tries to make sense of it. That's why you might see squiggly lines or colors when you open your eyes again.
It’s like looking at a blurry picture, then all of a sudden it becomes clear, and your brain fills in the blanks with shapes that aren’t really there.
Examples
- When you blink quickly in the sunlight, you might see bright lines or circles.
- Blinking at a white wall can make you see strange shapes or colors for a moment.
- After a long day of reading, blinking sometimes makes your vision go blurry with swirls.
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See also
- What Causes the 'Kiss Illusion'?
- What Is the Difference Between Dreams and Hallucinations?
- Why Do Paintings Look So Different in Real Life?
- Why do sunbeams diverge even though the sun is much more than a few kilometers away?
- Why Do Patterns Show Up Everywhere?
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