Bennard B. Perlman, The Golden Age of American Illustration: F.R. Gruger and His Circle. Westport CT: North Light Publishers, 1977, p. 294—
The Composition Class instructor, Henry J. Thouron, sought to stimulate the creativity of his students. He would draw a rectangular area, then locate within it a few freehand lines and a dot. “Now I want a picture where this dot is the lobe of a man's ear and these lines are incorporated,” he would advise. All of the elements would have to become part of the composition; that was the challenge. Each student then evolved an original picture where the design was controlled by the novice artist, rather than by happenstance.