translation.en: Even mathematicians, who in some sense are the freest of all thinkers, literally couldn't see not only the sea slugs around them, but the lettuce on their plate -- because lettuces, and all those curly vegetables, they also are embodiments of hyperbolic geometry.
translation.zh: 甚至数学家，他们在某种程度上 是最自由的思想者， 不仅不能确实看到 身边的海蛞蝓， 也看不到盘子里的生菜叶， 因为生菜叶，还有所有有褶的蔬菜， 它们都能体现出双曲几何。