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scale_shape_few() maps discrete variables to up to five easily discernible shapes. It is based on the shape palette suggested in Few (2012).
scale_shape_few()
scale_shape_few(...)
Common discrete_scale() parameters.
discrete_scale()
Few, S. (2012) Show Me the Numbers: Designing Tables and Graphs to Enlighten, Analytics Press, p. 208.
scale_shape_few() for the shape palette that this scale uses.