“The idea that our cosmos is not the only one.” “Yes. And that’s what Paphlagon writes about when he isn’t studying this cosmos.” “Now I’m a little confused,” I said, “because I thought you told me just a minute ago that he was working on the HTW.” “Well, but you could think of Protism—the belief that there is another realm of existence populated by pure theorical forms—as the earliest and simplest polycosmic theory,” he pointed out. “Because it posits two cosmi,” I said, trying to keep up, “one for us, and one for isosceles triangles.” “Yes.”