The pattern of seeds on the head of a sunflower, the geometry of a snail's shell, and even DNA gene sequencing all appear to be recursive structures.

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These natural phenomena exhibit recursive patterns or structures, where a simple base is repeated in a complex, self-similar form. Sunflower seed arrangements and snail shells often follow the Fibonacci sequence, a series of numbers where each number is the sum of the two preceding ones, illustrating a form of recursion. DNA's structure, while not recursive in the same mathematical sense, involves the repetition of base pairs in complex patterns essential for genetic information encoding and replication, showing a form of structural recursion.

The Pattern of Seeds on the Head of a Sunflower