The plot doesn't seem to have much to do with the title, a concept that is also referred to as the Golden Section or the Golden Rectangle. Fibonacci's theory states that, given a rectangle with the proportions of 1:1.619, one can infinitely dissect it into a square (1:1) and a rectangle which will always have a proportion of 1:1.619. Rounded to the nearest whole number, this proportion appears all over nature in the relationship between any two adjacent numbers of a sequence of 5, 8, 13, 21, 35, and so on. It's reflected in petals of flowers, limbs of marine life, proportions of pine cones (in the story), and many other natural occurrences. It is found throughout classical architecture and urban planning and is also a good proportion between strenuous and 'light' days in structured exercise regimens.
This season features new opening credits and theme music.