The squares marked A and B are the same shade of gray!
If you dont believe it, photoshop the image and cut both squares out of the image, and compare their colors.
I assume that none of them are actualy moving, and that they only appear to move because of our eye movement going from each one. The one we center our concentration on appears not to move while everything around them do appear to move so when we move our eyes around that causes the apparent motion. Correct?
If you back away from your screen enough, None of them move until you get about the distance you usaully are from your screen.
I also noticed that the ones with the Red Y on the ends hardly move or don't move at all.
The squares marked A and B are the same shade of gray!
If you dont believe it, photoshop the image and cut both squares out of the image, and compare their colors.
if you squint your eyes at the checkerboard one and stop focusing on the pattern you can see the colors start to look more the same, but yeah......that one was pretty dang trippy.