 Russell’s neutral monist universe is a plenum of (absolute) events—a vast assemblage of overlapping small occurrences which, given their short lifespan, are constantly replaced by new events. This mass of ever-changing events manifests all sorts of complex dynamic patterns. We have not yet discovered the laws that govern these events and give rise to the formation of these complex dynamic patterns. But we have physics, which describes the behavior of certain groups of law-governed events under the name of matter. And we have psychology, which describes a set of quite different regularities that obtain in very specific regions of this plenum of events—viz. in those regions that are filled by the pieces of matter that are called brains. But all the building blocks of the logical constructions that are matter, and all the building blocks of the logical constructions that are mental stats, have the same nature—they are neutral events.