The possibility of the brain appears limitless.
In actual fact, the structure of our brain depends on summation of the brain’s information.
In the same way that our individual brains sum up, the enormous mass of information makes it necessary to sum up human experience as well.
Because we have so many different experiences, the information that is summed differs widely across different groups, which creates cultures.
When the information is summed and edited in a group, it reinforces the culture, and enables individual and collective brains to retain evolutionary knowledge to survive adversity from wars, clashes, poverty, and famine.
Reality is an agreement. It is what people say it is.
Although we may think our particular group’s consensus is reality, this belief contributes to the silly argument that one culture has more validity than another.