 Matter-Field Dualism (Weyl’s Agens Theory of Matter): Matter and field are independent physical realities that causally interact with each other: matter uniquely generates the various states of the field, and the field in turn acts on matter. To excite the field is the essential primary function of matter. The field’s function is to respond to the action of matter and is thus secondary. The secondary role of the field is to transmit effects (from body to body) caused by matter, thereby in return affecting matter.