Uploaded September 2025 | Updated September 2026, 2 days ago

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You are walking across a vast grass field on a misty morning when you suddenly spot a lake in the distance. As you get closer, you notice a lone duck swimming peacefully across it. But this image doesn't last. After walking another ten yards, you realise your mistake—it isn't a duck but a plastic bottle. Your perfectly smooth conscious image changes rather abruptly, flipping seamlessly from duck to bottle.

Conscious visual perception—what we are conscious of seeing—is typically explained by light bouncing off the various items around us and hitting our eye's retina. The signal then travels to the back of our brain for visual processing and is fed forward through more complex areas until the brain can generate a perfectly coherent conscious image. A similar process takes place for other types of perception. But this raises a puzzle: if true, why is our conscious perception seemingly so perfect, lacking gaps even while we struggle to discern something?

[By Miriam Frankel]: qspace.fqxi.org/articles/258/seeing-is-believing