This paper considers consciousness from the point of view of extreme materialism, which asserts that everything is physical and extreme idealism, which asserts that ‘the world is my idea’. Attempting to avoid dualism, I argue that there is no fundamental ground of being and that consciousness is a no-thing. Science can explain its mechanisms in terms of ‘propositional knowledge’ but this is distinct from the ‘experiential knowledge’ that refers to the domain of meaning (psychic reality). Although consciousness is omnipresent and infinite, it is surrounded by the further infinity of the Unknown. Together these comprise the totality that Jung called ‘the Self’. The paper concludes with some reflections on the experience of Being in ‘the Isness Business’.