Who would win in a battle between the purist Air guitarists, or the more earthy Cardboard guitarists? The answer is: We all win!
Talk about documentation... "A cardboard guitar, used for air guitar purposes. Robin Yeatman was the first to ever make and "play" a hardboard guitar in the late 70's, inside the Heavy Metal club "The Soundhouse" in London. The guitar's are fashioned to look like a lead guitarist's instrument." via