Thatcher Illusion

The Thatcher illusion demonstrates holistic face processing. Locally inverting features (eyes, mouth) looks grotesque upright, but flip the whole face and the distortion nearly vanishes.

  1. Upload a face photo
  2. Draw ellipses around eyes & mouth
  3. Tap Apply to invert those regions
  4. Toggle Flip to see the illusion

Select a face photo

Front-facing portrait works best

Draw ellipses over eyes & mouth
Original
Thatcherized
Side by side