In case you still think that “seeing is believing”, here’s a classic example of an optical trick that is easy to play on the human eye.
It’s called the missing square puzzle, because in one configuration it appears as though the triangle occupies one more square than in the second configuration. But that’s not actually true.
The reality is that the hypotenuse (the longest side on top) is curved, not straight — which means it is not even a hypotenuse! The geometry rules that you think apply — don’t.
Here’s the Wikipedia article on the missing square puzzle to see how it works.
Now go lift something heavy,