In truth, however, the continual coming into existence of new beings and the annihilation of already existing ones is to be regarded as an illusion produced by a contrivance of two lenses (brain-functions) through which alone we can see anything at all: they are called space and time, and in their interpenetration causality. For everything we perceive under these conditions is merely phenomenon; we do not know what things are like in themselves, i.e. independently of our perception of them.
