Kashin Ogawa briefly explained tea utensils whether they are good or not in his book, Kissaben.He judged them good or bad only by whether they could function to draw out the essence of tea or not. He ignored other items like new or old or Japanese or Chinese. He believed that tea utensils should be used up until they fade away. Because they were substances and they should show the virtue of substances, that was they would disappear after they were well used. Tea utensils were not treasures just to be displayed.