Clarik's Theorem

Clarik's Theorem states that "societies dominated by a single intelligent life form, no matter how culturally disparate or variously organized, will always retain, within certain parameters, the essential accoutrements required for the existence of that life form."

This is given as an explanation for the similarity of the clothes, technology, equipment, languages, and so on, for a given species (for example, Humans or Chelonians) over widely different points in their history, even millions or billions of years apart.

While not directly cited, Clarik's Theorem would explain why the societies of humans on New Earth, Malcassairo, and others in the Far Future are recognizable to us.

Little is known about Clarik herself. (MA: The Well-Mannered War)