Cha dissolves canvas, a major ingredient in modern painting, into material woven of flat, knack, and hydrologic. In modern paintings, where reference has disappeared, experiments on materiality, such as 'Mathier,' which was so important, are solved by weaving canvases themselves. Through successive variations, the line of variation, outside, relief, form, background, beginning and end, is the living line. This line often goes out of frame and into many dimensions, and the tendency to exercise as the underlying thread becomes the line extends not only to plan, but also to installation and behavior, which involves the audience.