Base

Every creature (sophont, genome, bot or vehicle) has a base, which is a broad sizing scheme.

All sophonts (so far considered) are at base{0}, which is anything up to roughly a tonne in weight or up to 10x10 metres in visible area. In fact, the boundaries between bases is kept deliberately vague, because a creature whose size and weight places it near the boundary may be better played under one scale over another, for various reasons that don’t depend on their exact area, volume or weight.