"Uhm-" There's no hiding the flicker of confusion in his eyes when Jedao goes further than the limited bits of calendrical jargon that Arthur does remember - and even then it's not much, given that it was very much not an Andan-typical field of study. "R-right, er. Yes."
The laugh that nets is both surprised and relieved, and he bumps back against Jedao with a broad smile.
"I didn't know its mathematical name, no. I'm aware of it in the arts - painters crow about it, there's a way to do it with music but I never experimented with it myself."
"Well, it's important in math, too," Jedao tells him. "It's...it's the number that's the most impossible to ever fit in a finite fraction. It's endless and beautiful...it shows up in the places wherever the universe is twisting itself away from simplicity. It's in the way seashells coil and sunflower seeds grow and honeybees breed and the angle your DNA turns around itself."
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"I know Earth has Phi. Y'all even call it the Golden Ratio."
Which makes the comparison almost unbearably twee, except that it also works.
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"I didn't know its mathematical name, no. I'm aware of it in the arts - painters crow about it, there's a way to do it with music but I never experimented with it myself."
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"I think that suits him perfectly," he says warmly.