From the interplay of involution and evolution, consciousness and activity, subjectivity and objectivity, oneness and manyness, Rudhyar derives two principles inherent and coactive in Wholeness, the principle of Unity and the principle of Multiplicity. In Chinese philosophy they are called Yin and Yang (and Rudhyar's philosophical approach is perhaps closer in spirit to Chinese than to Hindu Metaphysics, although it includes elements from both).
      Because of the principle of Unity, motion (activity) is rhythmic and cyclic (occurring in units), and existence manifests in wholes. Because of the principle of Multiplicity, existence manifests as a multitude of wholes in which ever more expansion and differentiation occurs. Because of the principle of Unity, the process of differentiation (evolution) is self-actualizing — that is, it is guided from within by and toward the actualization of a set of inherent (involutionary) archetypal principles.