Body Atlas

Building Reality · Brain

Why do optical illusions still work when I know the answer?

You experience your brain's best guess, corrected by the senses.

The simple answer

It feels like you're seeing the world directly, the way a camera records a scene. You aren't. Your brain is building a model and using your senses mainly to check and correct it.

Go deeper

There's more: you experience your brain's best guess, corrected by the senses. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.

Explore this concept in Body Atlas →

Body Atlas is an educational product. It does not provide diagnosis, treatment, or personal medical advice. · Privacy