After the accident, I dreamed of returning to my chosen sport of mountain climbing. So it immediately became apparent to me that what I needed to do was design my own artificial limbs. So I had training in machining and carving metals and woods and making artifacts. And I went into the shop and started grinding and cutting and designing various limbs that were conducive to the vertical world of rock and ice climbing.
— Hugh Herr lost his legs in a climbing accident. Afterwards, he decided to make his own.