Is it true that there is no absolute morality?

[bennyboy]

Not a value system, no.

Okay, so a system can be both objective and subjective, but not a value system. Let's consider the possibility that the brain makes the value system. We experience that process of value formation subjectively, but the brain functions objectively, i.e. by the rules of physics. Unless you want to demonstrate things like free will, then we're left with all moral systems being both subjective and objective. That they vary among individuals is not surprising, since each biology has variations in its mechanism.