The Aethyrs Of Existence from Cornelius Coburn's blog

When there is nothing in existence that is external to the primordial, then this expansion of space, or, consciousness, is understood to occur within. This is what is meant by the expansion of the 'something' into the 'nothing'.

And although this may be referred as 'illusion', it is only illusion of perception; on the contrary, it is quite real; to paraphrase Otis if I may "It's as real as I want it to be."