The Fibonacci series is at the heart of Nature....
we have been told that everything in nature multiplies in a pattern of 0,1,1,3,5,8,13,21, etc. making the proportion between the numbers 1.618 or PHI.
I teach this to my classes...everything is in a fibonacci number like 3 or 5...see this apple core?
or this passionflower?
or this shell?
this is why people say:

but wait! sometimes it multiplies in other spirals...how can this be?
I never understood that...but BBC has explained it using Lucas numbers, the meristem and more. Watch this if you are a fibonacci fiend like me and if you have drunk your coffee this morning.
It's pace is quite rapid. So take a deep breath and hit 'play'.......