2000 years pass. In this painting, we can see Cain after all this time — he is still alive. Cain can't die or be killed [as person with a stigma]. He is a living reminder of his sin. He survived the flood and all wars, and now he lives a recluse's life because his face is half-decomposed. You can see him sitting in an old chair, surrounded by the paintings from the past and his own memories. There is no moral, no conclusions or remorse. As we live our own lives.
