Diagrammatic signs

Diagrams are defined as any kind of representation that makes available on themselves relations analogous to those in their objects. Therefore, the object of a diagram are always relations:

peirce-8

(…) a Diagram is an Icon of a set of rationally related objects. By rationally related, I mean that there is between them, not merely one of those relations which we know by experience, but know not how to comprehend, but one of those relations which anybody who reasons at all must have an inward acquaintance with. This is not a sufficient definition, but just now I will go no further, except that I will say that the Diagram not only represents the related correlates, but also, and much more definitely represents the relations between them, as so many objects of the Icon.

Joao Queiroz

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