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| Palisade
1. We certainly all agree that a wheel is seen rotating.
2. On pressing the show button, a brown picket fence (a palisade) will fade in. When it is fully opaque, it largely occludes the rotating wheel, but one can still perceive its rotation.
3. On pressing the move button, the palisade begins to, well, move.
4. What do the spokes of wheel look like now? A little distorted, similar to the icon on the top right? Yes, it is somewhat difficult to perceive this, due to the timing distortions (anti-aliasing) by computer presentation.
5. When fading out the palisade, the distortion vanishes as soon as a little of the wheel becomes visible through the semi-transparent palisade.
6. The effect changes drastically when changing the relative speeds.
7. If you observe the wheel for a while an then stop, you see opposite rotation. That's the motion after effect.
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