In these textures lies an extraordinary and unique feature of the sword - the steel itself possesses an intrinsic beauty. The Japanese sword has been appreciated as an art object since its perfection some time during the tenth century AD. Fine swords have been more highly prized than lands or riches, those of superior quality being handed down from generation to generation. In fact, many well-documented swords, whose blades are signed by their makers, survive from nearly a thousand years ago. Recognizable features of the blades of hundreds of schools of sword-making have been punctiliously recorded, and the study of the sword is a guide to the flow of Japanese history.