I wrote a poem according to the Fibonacci Sequence, starting with F
1 = 1 and ending with F
7 = 13:

This means that our starting value is 1 and after two values each following value is the sum of the two preceding values (values = syllables) leading to following value/syllable series:
F
1 = 1
F
2 = 1
F
3 = 2
F
4 = 3
F
5 = 5
F
6 = 8
F
7 = 13
The sequence was described by Leonardo of Pisa (1170-1250) - called Fibonacci - in his
Liber Abaci. He introduced the Hindu-Arabic numerals - which are more efficient than Roman numerals - in Europe, i.e. 9, 8, 7, 6, 5, 4, 3, 2, 1. The decimal numerals became popular almost three centuries later, when printing was invented. The sequence itself is assumed to be older - sixth century - and of Indian origin. But lets look at my poem:
The
world
once blue
turned pitch black.
For moments in red
you forever forfeit your white
and your fallen crest lies deep in nauseating green.