In the movie, the order of the aztec dimaond is 100 and x varies smoothly from 0 to 1. As shown by the colors one can see how the shapes of the arctic and tropical boundaries evolve as x changes. Warning...movie is long (562K)1 1 x x 1 1 x x 1 1 x x 1 1 x x x x 1 1 x x 1 1 x x 1 1 x x 1 1 1 1 x x 1 1 x x 1 1 x x 1 1 x x x x 1 1 x x 1 1 x x 1 1 x x 1 1