Each creature from Shen's original set of bone sculptures bears the title of "Unknown Creature No. __". (The pieces are numbered according to when they were created). They include a giant mosquito, a centaur, and a three-headed beast. Each skeleton consists of bones from real animals, bone meal, and glue. The bones come from creatures such as rats, rabbits, oxen, monkeys, and even humans. (He did not kill any humans to acquire the bones. He bought them from the Institute of Anatomy of the Harbin Medical School. The only animals killed were the rats for the Two Thousand Rats Project.)