The seeds of sunflowers display a two-dimensional pattern involving the Fibonacci sequence ^{2 3 1 4 5}. The seeds of a sunflower form two spirals, called parastichies, one set eminating from the center in a clockwise direction, the other in a counter-clockwise direction ^{3 2 1}. The spirals are generated from a sequence of curves winding in opposite directions, starting at the center and stretching out to the petals, with each seed sitting at a certain angle from the neighboring seeds to create the spiral ³. The number of spirals in each family of spirals usually follows the Fibonacci sequence ⁴.