I wonder, what do you mean with materialism (I ask this having been a 
materialist myself)?

Physics only describes relations. (see for instance here

I gather you accept MWI, so quite a lot of relations hold.

The question is, why the quantum (as Wheeler, I think, put it)? Bruno's 
COMP gives a very elegant _explanation_.

Also, with COMP, the mind-body problem indeed disappears. We have 
computations within computations within computations. (And I think that 
Bruno is correct when assuming that there is no _lowest_ level).

It needn't even be a pure idealism, but rather Russelian neutral monism 
- some states more or less conscious - the degree of consciousness 
depending on the degree of self-reflexivity (see for instance here for a 
theory of consciousness which works well with COMP:

Back to the ontological problem of the "grounding": materialism is in 
essence the thesis that there is, at bottom, a "substance", which has no 
independent properties, but serves as instantiator for other properties. 
But why should such a strange thing exist? Why not let the relations 
stand for themselves? Especially for an MWI-theorist; if you only accept 
a single world, matter does seem much more plausible - going through 
diverse transformations, that being all there is, and located somewhere 
in an otherwise empty spacetime or whatever - but those are all very 
naive intuitions which modern physics has moved beyond (and all the more 
so critical reflection on the results of modern physics).

A big question: why should there be such a thing as a lowest level, a 
grounding? While for a materialist, the imagination of "turtles all the 
way down"
is quite strange, computations all the way down is very intuitive. Well, 
  awe-inspiring intuitive ;-)) Think of the fractal video Bruno sent out 
a little while ago.

What explanatory power does matter hold? None, I conjecture. Please give 
at least one so we can discuss.


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