Just had one if these long discussions with a smart mathematician, and now I notice that sometimes I get the impression that computationalism (the only working philosophical edifice left) is non-obvious to 90% of people. I find that genuinely puzzling.
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The question of the cause of 2 is the same as the question of the cause of the shape of the Mandelbrot fractal. The natural numbers are literally a fractal, with Peano's axioms being one possible rule set, and we discover (not create) them and their properties by computation.
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If a universe presents itself via discernible differences (information) and is regular enough for computation, then its substrate (if it has one) must necessarily and sufficiently be a computer, i.e. a system capable of regular state change with Turing universality.
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