The word 'illusion' should be removed from every dictionary. It's one completely unspecific, indeterminate and misleading word and most subjects or patterns of discourse in which it appears have the same properties. The title of this post also reminds me of https://en.wikipedia.org/wiki/E-Prime Just searching for "* is an illusion" returns - consciousness - choice - spacetime - the world - physical reality - certaint…
You watch a real television show on a real television. The television is designed to create visual illusions of real things. But the television is itself real. The show is a dramatic rendering, an illusion, of real-life situations.
So there's three elements needed to make illusion. A referent, a representation, and a type.
Consciousness is real, but its contents are illusory, thought represents things that are not those things.