The idea that gravity somehow wants to push you towards one less dimension. I think it's really something deep that may well be true of quantum gravity, that when we really understand it better in the long run. But having said all that, and the very nice version of the sales pitch for the holographic principle, like you said, that's not the universe that we live in. We have a positive energy density in empty space, a positive cosmological constant. And so the conjecture is that true of our universe.

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