Why does an upside-down face still look normal, until it’s not? 🌀 Alex Dainis breaks down the Thatcher Effect, an optical illusion that shows how your brain processes faces as complete, familiar patterns rather than as individual features. When a face is flipped, that recognition system breaks down. This causes us to miss glaring distortions like upside-down eyes or a flipped mouth. The effect has even been seen in other primates, but here’s the twist: it only works when viewing faces within yo