The simplest way to understand hyperbolic space is to think of a lettuce leaf. It's a two-dimensional surface on which the curvature is bunched up in such a way that it puts a twist on flat Euclidean geometry. For years, mathematicians had a difficult time modeling the space visually until the late 1990s when Daina Taimina, a mathematician at Cornell, discovered that the complex shapes could be reproduced through crochet. Flash forward a handful of years to the day when Margaret Wertheim read about it and began to crochet the shapes herself. Her twin sister Christine soon joined in and before long they realized they had stumbled onto a series of forms they recognized as coral.