Spacetime structure is constructed semantically on four kinds of relation. The privileged axis of this diagram lies around event chains. These express pattern fragments φn downwards, and are aggregated within concepts upwards. The accretion of concepts from events may lead to significant overlap, which places some concepts closer to others by virtue of similarity of constituents. This is a form of detailed co-activation in the network of the lower layers. Concepts and themes arise from fragments accumulated through the sensory process.

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... physics, there is a simplifying separation of concerns in standard separable representations of spacetime. The Spacetime Hypothesis proposes a compromise, by postulating that all semantic distinctions ultimately map to four basic spacetime types (see figure 2): ...