Fibonacci spiral, also known as "golden spiral", is a spiral curve drawn according to Fibonacci sequence. There are many patterns of Fibonacci spiral in nature, which is the most perfect classical golden ratio in nature. Fibonacci spiral, a rectangle with Fibonacci number as its side, and then draw a 90-degree sector on the square. The connected arcs are Fibonacci spiral.

In real life, Fibonacci spiral actually has many uses in "design", such as

There are also common spiral stairs:

The design of spiral staircase is very space-saving.

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