Interesting questions. It makes me think of some things I read about how the brain integrates different sensory information into a seamless experience. I don'

Interesting questions. It makes me think of some things I read about how the brain integrates different sensory information into a seamless experience. I don't have a source for this, but the idea I remember is that nerve impulses from different sense organs arrive at different times due to the physical mechanism of propagation of the nerve signals. So the brain has to do a fair bit of post-processing to make our conscious experience seem fully integrated. That's why the sensation of touching our own finger and seeing ourselves touch the finger seem to correlate with the same moment in time. If our brains didn't do this, then things would seem all disjointed or perhaps entirely incoherent. That got me thinking: if our brain constructs that portion of reality, perhaps it actually constructs the entire conscious experience of reality down to the minutest detail. So we're never "directly" experiencing reality but only our brain's constructed (and evolved) representation of it. Perhaps that is the explanation for why the universe appears to have four dimensions in our day to day experience: because that's the most advantageous representation of reality by some evolutionary metric. So the process of biological evolution has crafted the brain and the brain crafts the experience of reality which includes all the rules of logic, laws of physics, and perceived physical phenomena. You could go out on a limb and perhaps even say that this explains how advances in pure mathematics often turn out to have some use in physics and vice versa; because mathematics (logic) and perceived physical processes are both rooted in the structure of the brain and are therefore rather intertwined even though the physical world appears to be separate from the mental world. These ideas seem remotely similar on some level to what Dr. Tegmark is proposing: that the observer (or, the evolved observer as I'm saying) plays a much more significant role in the structure of the universe than anyone has admitted up to this point.