""Our universe, in contrast, is quite flat -- and on astronomic distances, it has positive curvature," explained Vienna researcher Daniel Grumiller."

Thanks for the link. It's nice to see this is being researched.

It is interesting that the assumption in the article is - that if the universe is two-dimensional - then it must be a hologram.

I think this could be answered with a geometry of relationships, with the geometry being expressed two-dimensionally and interpreted three-dimensionally.

Possibly, we perceive the relationships of the flat geometry in a 3 and 4-dimensional way (including time).