To me, the red ball’s shadow places it on the ground rather than airborne

Rotating snakes

We are testing the idea that the illusion is caused by changes in pupil diameter, which alter retinal luminance and excite motion sensors.

The posted seasonal version of the effect was bought from Shutterstock but many more have been created by Akiyoshi Kitaoka:

www.ritsumei.ac.jp/~akitaoka/ro...

The bendiness does not change

THE BENDINESS DOES NOT CHANGE!!

Behold, the curvature blindness illusion

journals.sagepub.com/doi/10.1177/...

Static Christmas trees that appear to move

Christmas motion illusion. The trees are completely stationary. I am currently studying the explanations for this kind of illusion.