Fooled by depth
Ames window
Turn this trapezoid-shaped window slowly on a stick. What does it seem to do?
Swing back and forth instead of going around.
Why? Your brain assumes it’s a rectangle seen at an angle, so the bigger end must be the nearer one, even when it isn’t.
Picture: VanBuren, CC BY-SA 3.0 · Wikipedia(opens in a new tab)