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Ron Arad has created a unique set of sunnies called the Corbs, and it takes some inspiration on the traditional hinge for a design inspired by skeletal vertebrae.

His design team spent some time studying how an animal's vertebrae works, which allowed the spin to bend in only one direction. They applied that to the design of the Corbs which features a slatted design on the outside of the glasses' arms so they can bend inwards but never out. Vogue.

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[PQ Eyewear via FastCo Design]