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But what our Physics Project suggests is that underneath everything we physically experience there is a single very general abstract structure—that we call the ruliad—and that our physical laws arise in an inexorable way from the particular samples we take of this structure.

I call it the ruliad. Think of it as the entangled limit of everything that is computationally possible: the result of following all possible computational rules in all possible ways.

My initial objection is the following. I can imagine a universe where what is computable inside the universe is not sufficient to describe the universe. The universe might, for example, run on real numbers but due to something vaguely resembling the uncertainty principle those can not be fully used for computations within that universe and so the most powerful computational device within the universe ends up being something discrete like a Turing machine.

Admittedly those two quotes are essentially everything I have read about this topic and this might be addressed somewhere, maybe my objection itself is not consistent, but I think one needs a good justification why computability within a universe is essential for understanding or explaining that universe.

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