One night a few years ago, when he was still in college, Gavin Keightley, an artist, attempted to make couscous for dinner. It was a failure. But as Keightley scraped the couscous from the bowl, he noticed that it retained its shape. Maybe, he thought, he could make a mold out of it—mold as in something that forms something else into a shape, not as in fungus. Now Keightley has created a collection of furniture—one cabinet and some stools—cast in Jesmonite (a water-based molding material) based on molds made from food: not just couscous, but also bread, jelly, and mashed potatoes.