A sketch, drawing, outline,or plan designed to demonstrate or explain how something works. Not necessarily representational, it outlines, explains, or clarifies the arrangement of and relationship between the parts of a whole. Or to make such an image.A Venn diagram such as this one can be labeled to show how three things possess aspects which overlap, and others which do not. See concentric and eccentric.Related link: TouchGraph demonstrates interactive diagraming employing the latest in network theory. Click and play with these diagrams. Also see bubble diagram, didactic, graph, graphic design, map, mathematics and art, silhouette, and theory.