When the Australian twins Margaret and Christine Wertheim saw Dr. Taimina's work, they were reminded of the wrinkled shapes found in coral reefs. Since 2005 their organization, the Institute For Figuring, has spearheaded the creation of a crochet coral reef. Using the techniques of hyperbolic crochet, artists have created kelp, anemones, and a rich diversity of corals. This photo features urchins by Christine Wertheim and a sea slug by Marianne Midelburg.