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> That all the information needed to describe a 3D space can fit in a 2D space, like a hologram.

I'm not totally certain about this but I think you skipped over something important.

It's not that 3D space can be described by 2D space, it's that _our_ "3D" space appears to fit in 2D space because every time the universe puts too much information in the 3D space we get a black hole and a black hole is a 2D surface in 3D space.

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It's not quite that: The math only works in Anti de Sitter space, which is not the universe we live in.

The tiny black holes that are suggested by non renormalizability are one of the mysteries that make AdS/CFT an attractive direction in which to explore our own universe, partially because Susskind has already shown that black holes in our universe can be described by their surfaces.

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