TRIANGULAR PLOT

Although triangular plots are most often used to show the relative compositions of soils and rocks, it can be used for other systems combining three variables. Because I had to be different, I chose this one created in 2005 by someone estimating the probable outcome of the election in the UK. It reflects the estimated fraction of the population intending to vote for each of the following major parties: liberal democratic, labour and conservative. The current (at the time of this publication) estimate from opinion polls is indicated on the triangle by a white circle. The colored areas show the regions in which each of the corresponding major parties would win a majority in Parliament.

Link to website source:
http://ex-parrot.com/~chris/wwwitter/20050407-it_doesnt_matter_how_you_vote_either_way_your_planet_is_doomed.html