We were looking at a 1956 Fiat Multipla, a charming ergonomic marvel that predicted today’s popular MPVs. Rather grandly, I said to my guide: ‘I think you’ll find the source of the Multipla in an unrealised 1930s design of Mario Revelli di Beaumont.’ He looked a bit blank.

This exhibition is a rare attempt to explain the car, perhaps the most dramatic since the Museum of Modern Art’s 1951 New York show where Philip Johnson coined the term ‘rolling sculpture’.