Get it while it's fresh. And btw 'Axiomatic' is delicious brain food as well.https://twitter.com/gregeganSF/status/1220638322600509441 …
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The simulation running in our brain does not have somehow a window to the outside world. What we perceive as the outside world is the simulation. The relationship between mind and substrate is the same as between hardware and software.
Hmm. Unless you think how each gets its electrons makes a difference, with some novel sampled & conserved husbandry in one that defies computation because it adds no thermodynamic burden 
Software is a description of the world as a causally closed system of macrostates. But the only thing that is truly causally closed are the bottom level microstates of the universe. The evil force that inevitably encroaches on our neat macrostate description is entropy.
But the simulation in our brain still depends on raw data from the outside (i.e. the data drive the simulation to an extent). While a full universe simulation does not depend on the outside except in that it uses the outside substrate for the simulation itself.
The particle universe that we run on is a small, controllable subset of the substrate universe. The perceivable universe is a small, modellable subset of the particle universe.
You dont observe your thoughts, you are your thoughts.
I am not my thoughts. I can stop my thoughts but I still perceive how I persist. But the I is arguably a thought of my mind. I am downstream from my mind, but upstream of my thoughts.
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