There were broken and dismantled parts of machines that Enoch did not understand. Later, though, perusing the notebook where the boy had been copying out recipes, Enoch found sketches of the hearts of rats and birds that the boy had apparently dissected. Then the little machines made sense. For what was the heart but the model for the perpetual motion machine? And what was the perpetual motion machine but Man's attempt to make a thing that would do what the heart did? To harness the heart's occult power and bend it to use.