So here's my theory about this dark surrealistic masterpiece:

Philip lost his parents as a child and got "adopted" by Morris (there are clues that he abducted him in the scene where Morris informs Philip about the missing boy saying something along the lines of "It happened once in your time too, didn't it?" and gives him an evil smirk but i could be wrong). Morris then abused and tortured Philip in various ways and he came up with Possum…