Perception, cognition, and visualization.
Visualization refers to the cognitive functions of visual perception. In visualization, pictures combine aspects of naturalistic representation with more formal shapes to enhance cognitive understanding. These "diagrammatic" shapes derive from geometrical elements and thereby bestow visual concreteness to concepts conveyed by the pictures. Leonardo da Vinci's anatomical drawings survive as masterful prototypes exemplifying these traits.
Arnheim
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Harvard University.
D000716:Anatomy, Artistic / Q000379:methods* / Q000592:standards; D001290:Attitude; D003071:Cognition; D003116:Color; D006801:Humans; D008488:Medical Illustration; D014796:Visual Perception