Tufte's Horizontal Bar Lines

Want to learn more? I recommend working through: R for Data Science, R Cookbook, and R Graphics Cookbook.

Original source: http://stackoverflow.com/questions/13701485/r-graphs-creating-tuftes-horizontal-bar-lines

# load the ggplot2 package
# create the ggplot2 data
ggplot(msleep, aes(x=order)) +
  # draw the bars
  stat_bin() +
  # draw the black and white theme
  theme_bw() +
  # draw white horizontal lines on the yintercept between 5 and 20, spaced every 5
  geom_hline(yintercept=seq(5, 20, 5), col="white")