An illusion is a false image of reality. Thus, there can be no illusions without first that which is real. Therefore human consciousness cannot be simply the vehicle for illusions of reality, but must be the vehicle by which man can ACTUALLY know what is real (true) from what is ACTUALLY an illusion of reality (false). Otherwise, there could be no consciousness at all. For you cannot be aware of an illusion of an illusion; where consciousness is an illusion and thus so is reality, by extension.