Public Broadcasting Service - Fibonacci Sequence lyrics

I'm leanin' on a tree limb, lookin' at a leaf And the branches and the veins have a curious reach The lengths that they go form a ratio Like a Nautilus shell in an all-expanding spiral It's a Fibonacci sequence and it's gone viral There's no need for caution with a beautiful proportion For the pattern to be had, all you got to do is add Two numbers at a time and then you just climb First a one and a one for a simple little two One and two are three, two and three are five Fibonacci repeats in the things that come alive Pineapples, pine cones, artichokes, ferns The mighty Fibonacci always returns Round and round like the petals in a flower From the shape of a dolphin, to bones in your finger The Fibonacci sequence knows how to linger