Color of Points in Scatterplot does not change with color="color_name"

Hi, Anyone. New to RStudio, following along with R for Data Visualization (, chapter 3.3 Aesthetic Mapping. The text illustrates how to manually change the aesthetic properties of the geom, for example the color of the point.

1 ggplot(data = mpg) +
2 geom_point(mapping = aes(x=displ,y=hwy, colour="green")) # to show the points in green. No matter what color I assign, the output color of the scatterplot is pink.

Grateful for any thoughts you might have.

I found the answer with a little perseverance - and paying attention. "Set the aesthetic by name as an argument of your geom function; i.e. it goes outside of aes(). "

ggplot(data = mpg) +
geom_point(mapping = aes(x=displ,y=hwy), color="green")

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