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I get it, but I can't quite wrap my head around a mathematical universe with no substrate. As though any internally consistent ontology with self-aware structures (and, it seems to me, also those without) just "exists" apropos of nothing. What's doing the math?

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Once you postulate a substrate, you then have to wrap your head around what is its substrate, and what is that substrate's substrate and so on. When you look at it that way, the no-substrate version looks better.

Who invented all the digits of pi? They just are what they are without needing a substrate. It seems real because you are part of it like being in VR.

I said "what" is doing the math, not "who".

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