My thesis is that morality exists outside the human mind in the sense of being not just a trait of individual humans, but a human trait; that is, a human universal.
Once someone dreams a dream, it can't just drop out of existence. But if the dreamer can't remember it, what becomes of it? It lives on in Fantastica, deep under earth. There are forgotten dreams stored in many layers. The deeper one digs, the closer they are. All Fantastica rests on a foundation of forgotten dreams.