Puzzles that fool the eye
Stroop test
Say the color of the ink of each word, as fast as you can, without reading the words. Which words are harder?
The color names, much harder than the other words.
Why? Reading is so automatic for you that the word gets into your head before you can stop it, and fights with the color you’re trying to name.
Picture: Belbury, CC0 · Wikipedia(opens in a new tab)