Relative Size Animated Optical Illusion
Perspective matters. The angled lines in the animation presented below give the impression that the floor is sloping downward to the left. As such, the man standing on the left appears to be much shorter than the man standing on the right. As the man on the left walks up the incline to stand directly next to the man on the right, it is revealed that the two figures are roughly the same size. A similar effect can also be seen in the SUV illusion posted on this site a couple of years ago.
This relative size animation was created by Sheepfilms based out of Brighton, United Kingdom.