Well! according to the sketch your picture [which Whistler sent him in a letter] seems well-composed, the lines of sky, sea, the position of the figures all that seems very, very well done[, ] on opening the letter it struck me immediately, an impression of decorative ornamentation which makes a good picture appeal to the eye as well - upside down and any other way up. Arrangement, layout, composition. etc - mysterious words harmonious laws - in no way conventional - needs of the Artist glory of the Raphael's Michelangelo's etc etc - for me a repetition a hesitation, a matter of feeling - which should also be a law, a mathematical thing, like form, like light, colour[. ] I find similarities with the colour method which works by opposing colours to arrive at a harmony that is to say to make a canvas a complete whole, to put into a small space an image with all the forces all the principles of nature - [instead of showing a part of it]..