Casual -> Astral -> Physical

The jiva, or soul, is individualized consciousness: the infinite limited to, and identified with, a body. The beginning of its existence as an individual soul comes with the casual body. The soul's further encasement in an astral body is what causes it first to manifest ego-consciousness. Identification with that body of light is what causes one to think,"I am unique and different from other beings of light." Ego-consciousness becomes further bound to objective reality when it assumes a physical body, and all it's energy is directed outward through the physical senses.