The Fermat spiral has long fascinated mathematicians who have found that each sunflower floret is turned at a “golden angle” of about 137 degrees with respect to its neighbor. By rearranging the mirrors in a sunflower-like spiral pattern with each mirror angled about 137 degrees relative to its neighbor, the researchers found they could reduce the footprint of the mirrors used in the PS10 layout by 20 percent while increasing the plant’s potential energy generation.