Why do Orb Weaving Spiders Make Patterned Webs?

Walking through them or admiring at a distance, spider webs can be found nearly everywhere. So, why do orb weaving spiders make patterned webs

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Orb-weaver Spiders - Henderson County Master Gardener Association

The secondary frame in spider orb webs: the detail that makes the difference

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Garden Orb Weaving Spiders - The Australian Museum