Fooled by depth
Parallax
Which is nearest, the mountains, the hills or the trees?
The trees, though every layer is flat and on the same screen.
Why? When you look out of a moving bus, near things slide past fast and far things slowly. Your brain reads speed as distance, so the fastest layer looks nearest. Old video games used it to look deep.
Picture: Drawn by Science Playground · Wikipedia(opens in a new tab)