And now study the shadows in your mirror picture. They result from the opposite of what we have been talking about. In their case the angles of plane are turned away from instead of toward the light, and some parts, such as the hollows of the folds of your dress or coat, seem to catch no light at all and to be quite dark. I expect you find it much easier to detect the various gradations of dark or shadows than those of the light. And a great many artists, especially in olden times, seem to have seen the shadows more than the lights--for they represent the former with more subtlety, that is to say, with a keener eye for variations, than they do the latter. Indeed, the subtle rendering of light is particularly an accomplishment of modern artists.