What do you see?
Motion undershoot. Bar rotates through 180°, from 12 to 12 o’clock. But it appears to move only from 1 to 11 o’clock.
Red and green dots are in identical positions, vertically oriented. But when flashed at the motion endpoints of the rotating ring, they appear to be offset.
Same as the ring but for linear motion. Red and green bars are in the same position but appear to be offset. Try tracking them with your eyes; your eyes feel as if they move, but they really don’t!!
Same idea here! Right-angled cross looks wonky because moving sector edges shift the cross arms more than moving middles of sectors.