When British scientists were designing a small vehicle to land on Mars, they knew they wanted an artist to design a piece of art to go with it. They picked Damien Hirst. He came up with “a spot chart design, scaled down to 26 grams on a background of aluminium, and tinted with copper, cobalt, manganese and molybdenum in the nine colours of Mars, will be bolted to the side of the lander.”