“At the psychological or individual level, it may seem natural that spatial externalizations can switch between linear and circular forms, depending on the imagined timeframe, each adapted to express two temporal phenomena: repetitions in nature and society, versus the irreversibility of linear decay. The circular spatial model seems pervasive for representing the sequence and perhaps the subjective ‘duration’ of time, of the day or year, since several salient events in nature seem isomorphic to this specific model (e.g., the regular rising and setting of the sun and other stars, the waxing and waning of the moon).”