Four, holding a constructive property as a generic event creates a type-token relationship between events, and events are not limited to their three requirements (i.e. [x, P, t]). Critics of this theory such as Myles Brand have suggested that the theory be modified so that an event had a spatiotemporal region; consider the event of a flash of lightning. The idea is that an event must include both the span of time of the flash of lightning and the area in which it occurred.