“Tao is seen in the meriade of things.”
Tao is a concept. It is not an entity, it is not a force. It is a concept of explaining the universe from a dualistic behavior. This behavior is observed by the two underlying/deeper concepts: Yin and Yang.
Basically meaning, that Tao is in everything. Tao is the concept of a unification of matter and energy into a dual relationship (Yin and Yang).