Rotating Spiral
Stare at the center of the spiral for 30 seconds. Then, strictly look at your hand or a stationary wall. You will see it warping!
The Waterfall Illusion
🧠 How It Works▼
This effect is called the Motion Aftereffect (MAE). Your brain has neurons dedicated to different directions of motion (inward, outward, clockwise, etc.).
When you stare at an inward-spinning spiral, your "inward motion" neurons fire continuously until they fatigue. When you look away at a stationary object (which normally stimulates both inward and outward neurons equally), the exhausted "inward" neurons can't balance out the fresh "outward" neurons.
Result: The stationary object appears to expand or warp outward!