What are the four categories or levels that the Stoics believed the existing world appears?
1) Nature, and the impact of pneuma on it is relatively insignificant. 2) Plants, Pneuma is more active and responsible for growth and procreating of matter. 3) Animal kingdom, pneuma is more dynamic and enables matter to grow and procreate, but ALSO to feel and perceive. 4) Human level (highest level of interaction), pneuma, in the most complete form, represents human soul, which is part of nature.