This occurred to me today.
In plain R, the labels of the ticks of the Y axis are oriented vertically towards the 12 o'clock. In ggplot the behavior is different, the labels of the ticks on the Y axis are oriented horizontally towards 3 o'clock.
The ggplot approach is more intuitive to me, however I am really interested in the design decision behind this behavior? Any reference related to this?!
I know ggplot takes in consideration the guidelines from Tufte, is this one of those?!
require(ggplot2) # ggplot (plot2) ggplot(mpg, aes(displ, hwy)) + geom_point() # plain R (plot1) plot(mpg$displ, mpg$hwy)