Kenyon Cox,
Artist and Public, and Other Essays on Art Subjects
“ As the degree of relief varies, also, from the lowest possible to that highest relief which, nearly approaches sculpture in the round, the problems involved constantly vary. At each stage there is a new compromise to be made, a new adjustment to find, between fact and illusion, between the real form and the desired appearance. And there may be a number of different degrees of relief in the same work, even in different parts of the same figure, so that the art of relief becomes one of the most complicated and difficult of arts. ”
