Triangular Plot Map

http://ex-parrot.com/~chris/wwwitter/20050407-it_doesnt_matter_how_you_vote_either_way_your_planet_is_doomed.html

This is an example of a triangular plot which is used to graph three variables and is most often used to show relative compositions of things such as rocks and soils, but can be applied to any system with three variables and three only.  The proportions of the variables plotted always sum to the some constant and the vertex represents a 100% proportion of the variable to the left and 0% to the right.  As any one of the proportions increase in one variable the point also moves from the base to the opposite side of the triangle.