Sculptor Antony Gormley explains how his installations explore the way humans act, react and interact Your recent installations have explored human behaviour. Can you describe one of them? I had a work called Clay and the Collective Body , which involved putting a 100-tonne mass of clay, measuring 6 metres by 6 metres by 2.5 metres, in the middle of a well-lit, humid space, measuring 36 m by 36 m and 30 m high. It ran for 10 days. Everybody had to pre-book four-hour slots, and there were up to 100 people in the space at a time. You could say, where was your responsibility for the form of that piece? Well, it was in making sure that the conditions were constant and right within the frame that I had thought up. So people could play with the clay but you controlled the variables? The space had no windows and a slightly high atmospheric pressure of 1.5 atmospheres. It took place in Helsinki, where the temperature was -15 C outside and 24 C inside. You entered the space down a tunnel as if you were going down a birth canal. You went through airlocked doors and found yourself in this very bright, very large space with this dark material. From then on, it was a random human experiment. How did people react? This very precisely engineered context gave rise to an extraordinary and explosive outpouring of, you could say, collective unconsciousness. People communicated with each other non-verbally. At first, they