Others have explained what the Fibonacci sequence is, and where it shows up in nature. But you may also want to know – how does nature keep producing that? What’s the reason?
The reason is the simplicity of the rule. The next number is equal to the sum of the previous two. In nature, there’s a lot of things where the next thing builds on the previous thing or the previous several things; when the next thing builds on two previous things, it can naturally produce the Fibonacci sequence or a subset or approximation of it.
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