Second Series Rectangle, Spiral Example

This is the first example of a second series rectangle rendered with its "spiral". This is a "2nd order, fractional unit" rectangle. That means that the ratio of long side to short side is b/(a-b/2⁴). The ratio of a/b is (1 + √65)/8, or approximately 1.13278. A "zero order, fractional unit" rectangle is the same as the golden rectangle.