An analogy is a raft you use to cross a river

See the original posting on Boing Boing

In this Better Explained video, how the right analogies can make math joyful. “Numbers are like rocks.” But what happens when the number is 0 or -1? The analogy breaks down. “OK, numbers are like points on a line,” with zero at the center. But where on the line does the square root of -1 go? “OK, let’s add another line at 90 degrees to the other number line, where imaginary numbers go.”