Well, this idea has resurfaced again, it would seem. Two Japanese physicists (Nature News, November 2013) claim an obscure bit of physics theory was the clearest evidence yet that our universe could be just one big projection (see www.arxiv.org/abs/1311.5607 and http://phys.org/print306152303.html). In string theory certain types of unverses might actually be holograms of real two dimensional universes. This appears to be an extension of that mixed up fwith theoretical notions regarding black holes and what they mighyt actually be, and quantum theory as an extension of the theory of relativity. The downside of string theory, and probably black holes too, iss that nobody could actually prove it. This is an attempt to do so.
See also 'Why our Universe is not a hologram' at Universe Today – www.universetoday.com/107172/why-our-universe-is-not-a-hologram/