The phi spiral in one direction will often be seen counterbalanced with another one in the opposite direction – called the Phi Double Spiral.
This double spiral creates natural boundaries. For example, it matches up perfectly with the human eye as you can see in this picture. The pupil appears to be colored in with green and the iris appears to be outlined, but that’s actually the natural overlapping of the lines from the phi double spiral.
September 10, 2014