In the movie Heatherwick explains how the boat was commissioned to transport tourists and locals along the Loire river between Nantes and Saint-Nazaire.
Unlike a traditional two-hulled catamaran, the boat will have a single hull that folds back on itself and stretches over to form an infinite loop. This makes space for two diagonal viewing decks from which passengers can look out towards works of art along the river banks.
Heatherwick has been talking about his work in a series of movies filmed by Dezeen at his exhibition at the V&A. Hear him talk about his studio's Christmas card tradition here, and how he created the UK pavilion at the Shanghai World Expo here. Find out about his design for a new London bus here, and see him demonstrate the machine that dispenses guides for the exhibition here.