John Verzani’s book has a title page that shows a scatterplot with histograms of x and y variables along the two axes. It is a very powerful way of looking at two distributions. The plot was generated through a function simple.scatterplot. The function is made available as part of the UsingR package, which can be installed from CRAN. The syntax of simple.scatterplot is indeed quite simple and can be modified to, for example, show boxplots instead of histograms on the side. That would be really interesting!!