Long and short
Which horizontal line is shorter: the top or the bottom? Trick question – they’re the same size, even though your mind perceives the one with outward wings to be longer.
Looks like the background is spinning around a circle, but both are staying completely still.
Moving right along
It looks like the background underneath the sphere is moving downward, like a conveyer belt or a slow treadmill. But it’s a completely still image!