ABSTRACT
Diagrams, charts, and graphs have strong decorative (i.e., aesthetic) consider-
ations but also naturally have inherent informative properties. In the Peircean
analysis, true informative purpose can be attained only under specific conditions
where the essential visual properties of information are enhanced: (a) redundant
and extraneous details stripped away, (b) contrasts between critical details
emphasized, and (c) generalizations represented in the graphic validated by col-
lateral textual support. If these conditions aren’t met, then the diagram/chart/
graph will degrade into a mere image of information, a decorative-indicative
substitute for information, most typically, an impressive looking graphic that
few or none in the audience can understand. We will use the term diagram to
cover all the usual senses of that term (Dictionary.com):
1. a figure, usually consisting of a line drawing, made to accompany and
illustrate a geometrical theorem, mathematical demonstration, etc.
