Contemporary Peruvian potters use similar marks, called sígnales, to indicate ownership and reclaim work from shared kilns or storage facilities.

Analogies have a related (and not entirely separable) justificatory role. This role is most obvious where an analogical argument is explicitly offered in support of some conclusion. The intended degree of support for the conclusion can vary considerably. At one extreme, these arguments can be strongly predictive. For example: Example 1. Hydrodynamic analogies exploit mathematical similarities between the equations governing ideal fluid flow and torsional problems. , a system of pipes through w