The sequence where each number is the sum of the two before it. It appears throughout growing things, which is why it feels like a natural law.
Named for Leonardo of Pisa, called Fibonacci, who introduced the sequence to Europe in Liber Abaci in 1202; the same growth pattern was described earlier in Sanskrit prosody by Indian mathematicians.
The sequence where each number is the sum of the two before it: a growth pattern found throughout living things, which is why it reads as a law of nature rather than an invention.