"People sometimes say, "Isn't it boring, isn't it always the same? It's the same lines." I go, "Well, do you play tennis? Because that's the best analogy I can give." If you go out eight times and play tennis eight times this week, yeah it's the same rules but it's a different game every time you're out on that court.And that's the best analogy I can come up with the theater."

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And last of all we have the secondary forms of crystals bursting in upon us, and sparkling in the rigidity of mathematical necessity and telling us, neither of harmony of design, usefulness or moral significance, nothing but spherical trigonometry and Napier's analogies. It is because we have blindly excluded the lessons of these angular bodies from the domain of human knowledge that we are still in doubt about the great doctrine that the only laws of matter are those which our minds must fabricate, and the only laws of mind are fabricated for it by matter.

— James Clerk Maxwell