First he says, "It is the fullness of life that is the illusion," because the emptiness visits him so fully. Then he says, "No, it is the emptiness of life that's the illusion," because the fullness of life is upon him. Back and forth, forth and back again, he swings between fullness and emptiness, emptiness and fullness… Until one day… It dawns on him: the real illusion is the cup.