2D/3D holographic universe/vision

I will gratefully read those links, thanks.

It’s conventional to talk about images on paper as 2D when paper and ink marks are obviously 3D objects, so it’s a bit tricky to know how abstract people are being.

It’s not the least bit tricky. You can’t talk about 2D without being abstract because 2D is an imaginary state.

Well, Leonard Susskind and a whole load of other smart people are awaiting your guidance.