There is more unknown than known by far

e.g.

When the corpus callosum between the brain hemispheres is severed, the self becomes two selves

And indeed the brain is modular as we can see when parts are damaged but the whole is not destroyed

Unless you believe that brains are magic you gotta admit that 2 hemispheres passing information between themselves is materially + informationally no different from 2 entire brains (persons) doing the same

Just extend that infinitely up and down forever to see that the universe must be conscious in at least some sense.  All things have a point in spacetime where they were physically connected.  Thus given that timescales are irrelevant for computation, all intelligence in the universe is spatiotemporally contiguous.  The brain of the cosmos

This is some unknown part of physics that intersects with information theory, cosmology, and pretty much everything.  And everything that will ever be known will do that through consciousness.  I’m telling you it’s crazy