How much does a cloud weigh? That was the question Karen LaMonte asked us in an email a year and a half ago. LaMonte—an artist who lives in Prague and is known for monumental sculptures in ceramic, bronze, and glass—wanted to create a marble cloud sculpture of similar weight as a real cloud. What resulted is LaMonte’s sculpture Cumulus, which is an accurate visualization, in marble, of a numerically simulated tropical cumulus cloud. Cumulus is currently on display during the Biennale in Venice.