Abstract

We seem to have strong intuitions that many visual representations -- such as descriptions, depictions and diagrams -- can be classified into different types. But how should we understand the differences between these representational types? On a standard view, the answer is assumed to lie in the presence or absence of a single property. I argue first that this assumption is undermotivated, and offer a particular two-property analysis, which can be used both to differentiate the various types and to understand better what factors affect changes in classification. This in turn can also be used to capture a core idea of perspicuity, and to ground an argument for the general perspicuity of diagrams as a representational type. Finally, I suggest that two complementary and independently plausible theories bearing on the nature of diagrammatic representation can be located within the suggested two-property approach