• When manually setting aesthetic propoerties, we need to pick a value that makes sense for that aesthetic:
    • The name of a color as a character string, e.g., color = “blue”
    • The size of a point in mm, e.g., size = 1
    • The shape of a point as a number, e.g, shape = 1, as shown below.
  • We can learn more about aesthetics mapping by looking at this vignettes aesthetic specifications vignette