Several years ago, when Chris Cox was running his own manufacturing business in Asia, a client asked him to mount a video camera on a rifle.

"It seemed like an awful idea for numerous reasons," recalls Mr Cox.

"Then we said, 'Wait a minute, why would you want this? It's because you want your true point of view while using the rifle.'"

That desire to capture a first-person perspective eventually led Mr Cox to create a line of sunglasses, known as Pivothead.

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