Bloody Head

So since the Multiple Heads project is due in a week now and I was thinking about different artists that use heads in their work. I remembered Marc Quinn who creates a self portrait, using his own blood. He creates a cast of his head then takes his own blood over a period of time and uses that as the material. He creates one of these pieces every 5 years or so and it is still ongoing. One of these pieces is also in the background in a scene in Kickass. How to become anemic 101