// Variant of Example 4-9 from Reas/Fry book

size(800, 300);

strokeWeight(2);
for (int i = 50; i < 700; i += 20) {
  line(i, 100, 1.5 * i, 130);
  line(1.5 * i, 130, 1.2 * i, 200);
}