Reality seems straightforward. It seems what it is. But if you dig deeper, reality is not so simple. It is not what it seems. Our brain creates its own reality. And is there a universal reality, at all?
Let me call the universal, objective reality out there the ‘universal reality‘. It is the universe – and maybe beyond – and everyting that it comprises. Space, time, matter, milky ways, stars and planets, living creatures, and presumably undetectable ‘objects’ and ‘matter’, such as dark matter. Up to elementary particles, force fields, energies, whatever those really are. Although there are interesting theories emerging every year, eg. that the universe is a neural network, we really can only guess about its true nature. It is not an interpretation of our brain. It simply exists, even if we would not exist.
Then, there is the scientific reality. Scientific reality is the best possible image that we, as human beings with our brains, can create of the physical reality. It is created by the sciences and is, by far, the best (predictive) mental model we have of the physical reality. Whether it is a true representation or far from that, nobody knows. The scientific reality is based upon rules or scientific laws. Such as the rules of mathematics and the laws of physics, eg. Archimedes’ Law (F=ρgV), Newton’s Law (F=ma), Einstein’s equation (E=mc²) and of course Schrödinger’s equation (ih∂Ψ/∂t=HΨ)
Finally, there is, what I call, the humanist reality. This is a more subjective experience, by human beings, of reality. It is usually shared by groups. You may call it a ‘group reality’. It is described and partly created, or at least confirmed, by the humanities. There often is no hard ‘scientfic’ proof for the humanist reality or realities. It is what people believe, and often, are convinced of. Or it is what we have constructed – often, in the course of time. The purest form of, what I call, mind models. It comprises eg. economic models, law and politics, linguistics and (classical) languages, archaeology and history, anthroplogy, sociology, psychology and psychiatry, art history and performing arts, and possibly religion.
Yuval Harari calls it “our [collective] ability to create and believe fiction”:
The truly unique trait of Sapiens is our ability to create and believe fiction. All other animals use their communication system to describe reality. We use our communication system to create new realities. Of course not all fictions are shared by all humans, but at least one has become universal in our world, and this is money. Dollar bills have absolutely no value except in our collective imagination, but everybody believes in the dollar bill.
Smithsonian Magazine, What Makes Humans Different? Fiction and Cooperation – Arik Kabbai, February 2015
By the way, some people even say, that what I have called “universal reality” does not exist at all, that there is only the reality in our mind, what I call the scientific, group and personal (see below) reality. See eg. the theories of Bernardo Kastrup and his ideas on metaphysical idealism, among other based on quantum mechanical principles. Sounds a bit like The Matrix (movie), right?