Triangle Plot

This plot was taken from http://ex-parrot.com/~chris/wwwitter/20050407-it_doesnt_matter_how_you_vote_either_way_your_planet_is_doomed.html

This is a good example of a Triangle Plot or Ternary Plot.  This is a plot that has three different variables that all add up to a single constant.  It gives the viewer a chance to look at the ratios of these variables in an equilateral triangle.