Fibonacci Sequence
The Fibonacci sequence is simple: start with 0, 1, and each subsequent number is the sum of the previous two.
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, …
Where It Appears
- Spiral patterns in sunflowers and pinecones
- Branching in trees
- Shell spirals (nautilus)
- The golden ratio $\phi \approx 1.618$ emerges from ratios of consecutive terms
It is not a universal law of nature, but it appears often enough to be genuinely fascinating.