John Coplans, on the other hand, chose Type 55 film (which yields a black-and-white positive and negative) in the 1980s to record his own stolid nude body in interlocking blocks of hairy flesh, self-portraits that owe something to Henry Moore and Philip Guston.
The reason reversing such gains is hard is that servicing this extra flesh means a person's maintenance diet (the food required to keep his body ticking over) creeps up with his weight and so does his appetite.
Last year, 75 years after a British climber, George Mallory, disappeared, similar numbers had already started out when Mallory's body was discovered close to the summit, his right leg broken in two places but the flesh miraculously preserved in the cold, dry air.