Space-time is like some simple and familiar system which is both intuitively understandable and precisely analogous, and if I were Richard Feynman I'd be able to come up with it.

"Teaching Physics", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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Space-time is like some simple and familiar system which is both intuitively understandable and precisely analogous, and if I were Richard Feynman I'd be able to come up with it.