 The resulting picture is this. Described at the most fundamental level, the constituents of the world have properties that are neither mental nor physical. These neutral properties of every fundamental entity give rise to physical and mental (or protomental) properties. Thus each fundamental constituent is complex: it has mental (or protomental) properties, it has physical properties, and it has these two sets of properties as a necessary consequence of its having a third set of properties—the neutral properties.