 For Conway body is, therefore, not a substance distinct from spirit, but both are modes of the same created substance differentiated only by relative density. Conway uses the metaphor of light and dark to express the difference between them, light being associated with spirit (soul) and darkness with body. In the scale of being, the higher creatures are more active, spiritual and bright, while the lower creatures are on the scale, the less active and more corporeal and darker they become, though they never become completely dark. 