 These exhibitions and related public programming make mathematical and scientific concepts accessible to laypeople.The Wertheim sister's "Crochet Coral Reef" project is one of the largest participatory art and science endeavor in the world.By creating giant installations that mimic living coral reefs, crocheted out of yarn and types of plastic, and using algorithms inspired by hyperbolic geometry, the project resides at the intersection of mathematics, science, handicraft, environmentalism and community art practice.