"Self" is a frozen sculpture of the artist's head made from 4.5 litres of his own blood, taken from his body over a period of 5 months. In interview in 2000, he remarked, "Well, I think it’s a great sculpture. I’m really happy with it. I think it is inevitable that you have one piece people focus in on. But that's really good because it gets people into the work."
My photographs of Marc Quinn's work
http://www.marcquinn.com/ - Link to his website