Guides show us the way. They give us absolute directions in a relative world. We need guides in graphics to help us associate categories or quantities with aesthetics. Position, for example, allows us to compare magnitudes among graphics in a frame, but we need a positional guide to help us to relate magnitudes to non-graphical information. Color can help us discriminate categories, but we cannot associate colors with specific categories without a color guide.
KeywordsAesthetic Attribute Annotation Guide Tick Mark Scale Break Guide Function
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