Arrows, coloured by the mix of votes in 1987, pointing in the direction of movement on the electoral triangle, with length in proportion to the magnitude of the swing, are drawn in the 633 mainland parliamentary constituencies (Appendix C) on the equal electorate cartogram — software by author on an Archimedes computer.
Arrows are a simple but effective form of glyph. They are especially useful when groups arise which point in similar directions. Here they each show the three party vote and direction and size of recent general elections swings. They can be seen to be flowing together, as the labour strongholds move further to the left, and the home county areas mill about, as the people decide which way to turn next.