To Do And Notice
Notice that the spiral seems to be either moving away from you or towards you depending on the direction of its spin.
Stare at the center of the spiral for about 30 seconds. Look up at a wall. Notice that the wall seems to be rushing toward
you or away from you, opposite of what the spiral was doing.
What's Going On?
Mechanisms in your eye and brain detect inward and outward motion. When something is standing still, the receptors
detecting inward motion are in balance with the receptors detecting outward motion.
What else can I do?
The Squirming Palm exhibit also demonstrates a similar phenomenon
What if the animation is playing too slow to see the effect?
Results of this experiment may vary depending on your computer's processing speed, the amount of RAM allocated to
your browser and the colordepth your monitor is set to.
You can increase animation performance by: