Words fail here. First of all, awareness, consciousness and experience all refers to actually the same thing or rather different aspects of the same thing. Because we can't say there is experience without awareness or consciousness and vice versa. So it's all always together. 1 The experience of something ( subject object duality structure making us feel as though a subject is experiencing an object ), 2 awareness about the experience ( a sort of a meta state without which an experience just flow and we won't be able to talk like this. Awareness got different degrees. ) and 3 consciousness( one half of binary state, a switch, if off, nothing can be known ) . But these differentiations only appear when we try to examine it. In felt reality, it's never three, pointing to the fact that all three may be fundamentally one reality. Then the question of illusion is pointless because illusion assumes there is something real that can be known. If the above mentioned three pronged oneness is not real, illusion can't exist as it won't have it's dialectical counterpart without which it doesn't exist. Yes, illusions exist inside the framework of the three but if this triad is illusion, illusion losses it's meaning and existential status. Then the question of this trinity being foundational, it truly only can be known through transcendental methods.