If an object has a center radiating arms will reinforce the edges and body of the form. Spokes in a wheel, membranes in an orange, starfish, all kinds of plants and animals use this structure and variations of it.
The attractive petals on a flower lead the insects and birds into the center. The beauty is of a very practical kind. Without it the species would not survive. Birds and especially insects see colors in flowers we do not see.
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