In our dreams all the inhabitants of our mind resurrect, forming a world within ourselves. We see in the dream things and beings, a friend, a foe, an animal, a bird, and they come from nowhere, but are created out of our own selves. This shows that the mind of an individual constitutes a world in itself, which is created and destroyed by the conscious or unconscious action of the will, which has two aspects: intention and accident. We have experience of this world of mind even while awake, but the contrast between the world within and without makes the world without concrete and the world within abstract.