Dead Horse Nebula.

When Hay was seven years old, he found a dead horse in an open field and watched his father and other adults struggle to get rid of it. Unsure of this memory, he is nonetheless very influenced by this incident and, when he cuts himself during a sacrificial rite, everything comes flashing back. Step by step, Hay goes down an inevitable and spiritual path where he confronts the relationship between human and nature, the unity of matter and the living.