His documentaries like 'Grizzly Man' and 'My Best Fiend' explore the profound psychological impacts of separation between humans and animals, and between individuals.

Films like 'Princess Mononoke' and 'Spirited Away' deeply examine the tragic separations between human civilization and the animal/natural world.

Her documentary 'The Gleaners and I' and narrative works compassionately explore displacement, loss, and separation across human and animal communities.