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.