If anything is said to be an illusion, the following two questions are begged:
An illusion of what?
An illusion for whom?
Both “what” and “whom” must be actual things, and must be distinct. They are, in fact, a prerequisite to illusion. Unless some actual one is experiencing an illusion of some actual thing (that is, unless a real person is experiencing an illusion of a thing or things derived from, and apprehended via the reference of, reality) then there can be no illusion. Therefore, illusion itself cannot be a (philosophical) primary; and I know that this statement may seem obvious, but when you hear the scientific determinists–the post modern priest class as I like to call them–implicitly or explicitly refer to the illusion of human choice and by extension the illusion of consciousness, it seems that obvious statements are no longer so obvious. When leading neurological scientists like Sam Harris and Nobel Prize winning astrophysicists like Stephen Hawking can’t seem to follow basic rational consistency or utter a single coherent philosophical statement, one is forced to explicate the obvious, unfortunately. (As good as these guys are at science is as bad as they are at philosophy, is what I mean to say.)
Interestingly–and this will annoy the Objectivists and others who nod to Aristotle–“Existence”, as a metaphysical primary, is like “Illusion” as postmodern philosophy’s (e.g. scientific determinism) epistemological primary. It begs the same two questions:
Existence of what?
Existence for whom?
As with illusion, both what and whom must be actual things and they must be distinct. Which means they must have a root that precedes existence. If what and whom are both metaphysically identical (both absolute) products of Existence–which Existence as a metaphysical primary implies–then there is no root distinction between what exists and who observes it to exist (“who” being the rational frame of reference for that which is). And therefore there is no one to define what exists. And if what exists cannot be defined then who exists cannot either. Which renders Existence as a metaphycial primary entirely absent meaning. Which it is.
(Side note: You see, all definitions of what exists are products of man’s consciousness, which by the boundaries placed upon truth by Existence can have no fundamental, objective bearing upon reality, which is entirely ALL of Existence, including consciousness itself. Existence doesn’t just subordinate consciousness, it makes it entirely irrelevant and redundant…that is, impossible, and…that’s a problem.)
My point here is that postmodern determinism such as averred by atheistic and scientifically rooted philosophers proffers the idea of Existence and Illusion as metaphycial and epistemological primaries, respectively. And in both cases these primaries beg two questions which must be answered and then when answered undermine those primaries entirely. “Whom” and “What” cannot at root be products of Existence or Illusion. It’s actually the other way around.
Or you might say that if “Of what?” and “For whom?” have no answer then Existence and Illusion as anything but subjective assumptions are nullified. And if they have an answer then Illusion and Existence as anything but subjective assumptions are nullified.