List of some ggplot2 shapes
See also
Other enum helpers:
AestheticFields,
AestheticProperties,
Alignments,
AtomPlots,
ColorMaps,
ColorPalettes,
DataMappings,
DefaultDataMappingValues,
Directions,
ExportFormats,
ExportUnits,
FontFaces,
HorizontalJustification,
LegendPositions,
LegendTypes,
Linetypes,
MoleculePlots,
PlotAnnotationTextSize,
PlotConfigurations,
Scaling,
Shapes,
TagPositions,
TickLabelTransforms,
VerticalJustification,
tlfStatFunctions