RECIPROCITY

The larger two objects of approximately the same size are, the greater the distance between them. (cf: the distance between planets, the distance between stars, and the distance between galaxies, and: the distance between mayors, the distance between governors, and the distance between heads of state and: the distance between teachers, the distance between principals, and the distance between superintendents and: the distance between desks of a given size – it would be interesting if, under some plausible / appropriate metric all these distances were numerically similar)
keywords: General Systems Theory, life, Physics, Astronomy, Psychology