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Watch this one together

~6 min · materials: none; one hand can cover an eye.

How can one eye miss a patch while the world still looks complete?

Close one eye to peer through a toy telescope: the room still feels complete even though that eye has a tiny place with no light sensors.

Talk about it

  • Before moving a test dot, point through the crossed light path and predict which internal retinal side it reaches.
  • The message vanished but the background did not look black. What information could the brain have borrowed?
  • Why would two eyes with different viewpoints cover more of the world than one?
Watch it together

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