 Of course, as pictures are likened to such things as diagrams, they also need to be distinguished from them. Goodman’s claim is that the difference between pictures and diagrams is syntactic, i.e., has to do with the composition of the characters or symbols. Pictorial symbol systems, when compared to diagrammatic systems, tend to be relatively replete. That is, to the interpretation of a picture typically a larger number of features is relevant than to the interpretation of a non-pictorial dense system. A drawing by Hokusai may be made of the same marks as an electrocardiogram. Yet, while in a linear diagram as the electrocardiogram only relative distances from the originating point of the line matter, in the drawing a higher number of features—color, thickness, intensity, contrast, etc.—are relevant (Goodman 1976, 229–230). Diagrams typically are relatively “attenuated.” Accordingly, the difference between diagrams and pictures is only a matter of degree: typically, with a picture a smaller number of features can be dismissed as contingent or irrelevant.