Seth argues that consciousness is a controlled hallucination and that "qualia" is just a necessary part of the process by which we interpret the signals from our sensory organs. We necessarily have an internal concept of "chairness" that we apply to sensory inputs that match something that could be a chair but such "chairness" does not exists outside our minds in a similar way to our concept of colors which do not precisely map to any single set of sensory inputs or a certain strictly defined wavelength of light because lighting conditions etc. changes this perception.

This is a part of his argument for why the "hard problem of consciousness" is not a real problem, it is just a question we ask based on our intuitions from what our subjective experience feels like but that intuition is wrong.