One of the strangest exhibits at the opening of "Design and the Elastic Mind," the very strange show at the Museum of Modern Art in New York that explores the territory where design meets science, was a teeny coat made out of living mouse stem cells. The "victimless leather" was kept alive in an incubator with nutrients, unsettlingly alive. Until recently, that is.

Paola Antonelli, a senior curator at the museum, had to kill the coat.