To obtain this, he studies human and animal anatomy by dissection. At that time, corpses can’t be preserved in cold rooms so they decay rapidly. Leonardo da Vinci has then very little time to study and learn everything there is to know about the human body; he reproduces even the slightest detail in his drawings and sketches. Besides using the traditional theories of proportions, as shown with his emblematic Vitruvian Man, Da Vinci thinks about his models from a functional point of view, and from the inside. This way he can perfectly grasp the movements, the strength and, as he perceives it, the soul of the creatures he studies.