Originally published on CUInsight.com
When I was young, a teacher shared an analogy that has always stuck with me. I can’t exactly remember what she called it, but I’ve taken to calling it “2-D Bob Meets 3-D Jill.” My teacher started by sketching a diagram on the board that looked something like this.
Bob has invited some friends over to play cards. Everything in Bob’s world is 2-D, including Bob, his friends, the card table, the cards, and even Bob’s house. Everything exists on a single, flat plane and there is no third dimension. (You may wonder how the 2-D card players could see the numbers on the cards that are flat on the 2-D plane, but probably best not to think about this analogy too hard.)
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