What is the Thatcher Effect?
Discovered by Peter Thompson in 1980 using a photo of Margaret Thatcher, this illusion demonstrates how our brain processes faces differently when upright vs. inverted. When a face is turned upside-down, we lose the ability to detect grotesque distortions — like inverted eyes and mouth.
Drop a portrait image here
PNG / JPG / WEBP — front-facing portrait works best
📷
Take a selfie
Uses your front camera
How it works here
MediaPipe Face Mesh detects 468 facial landmarks in real-time. The eye and mouth regions are precisely located, then flipped vertically (inverting them) with feathered blending to hide the seams. The manipulated face looks bizarre upright — but surprisingly normal when rotated 180°.