Here’s a beautiful spiral illusion. As the pattern spins in this gif, you can feel yourself sink into the spiral. The spiral aftereffect is also strong! Here’s what the graphic looks like when it’s not spinning:
Here is an incredible example of The Spiral Aftereffect. Watch the spinning, moving gif below. Then look at a strong stationary pattern nearby. Watch that spin and bubble and move as well. That’s the spiral aftereffect.