The glow of grime Of course this 'sheen of antiquity' of which we hear so much is in fact the glow of grime. In both Chinese and Japanese the words denoting this glow describe a polish that comes of being touched over and over again, a sheen produced by the oils that naturally permeate an object over long years of handling—which is to say grime. If indeed 'elegance is frigid', it can as well be described as filthy. Jun'ichirō Tanizaki & Thomas J. Harper, In Praise of Shadows timeaestheticsfilthflaws
By the handling of human hands This type of beauty grows with each passing day. Utilitarian craftwares become more beautiful the more they are used, and the more beautiful they become, the more they are used. Moreover, the heavens have ordained that these objects should attain an even greater beauty as they become worn by the handling of human hands. Yanagi Sōetsu, The Beauty of Miscellaneous Things Putting Thought Into Things utility