Thinker is suggested by the grip of his toes on the rock, the rigidness of his back, and the differentiation of his hands. Speaking of The Thinker, Rodin illuminated his aesthetic: "What makes my Thinker think is that he thinks not only with his brain, with his knitted brow, his distended nostrils and compressed lips, but with every muscle of his arms, back, and legs, with his clenched fist and gripping toes." Sculptural fragments to Rodin were autonomous works, and he considered them the essence of his artistic statement. His fragments – perhaps lacking arms, legs, or a head – took sculpture further from its traditional role of portraying likenesses, and into a realm where forms existed for their own sake. Notable examples are The Walking Man, Meditation without Arms, and Iris, Messenger of the Gods. Rodin saw suffering and conflict as hallmarks of modern art. "Nothing, really, is more moving than the maddened beast, dying from unfulfilled desire and asking in vain for grace to quell its passion." Charles Baudelaire echoed those themes, and was among Rodin's favorite poets. Rodin enjoyed music, especially the opera composer Gluck, and wrote a book about French cathedrals. He owned a work by the as-yet-unrecognized Van Gogh, and admired the forgotten El Greco. Method Instead of copying traditional academic postures, Rodin preferred his models to move naturally around his studio (despite their nakedness). The sculptor often made quick sketches in clay that were later fine-tuned, cast in plaster, and cast in bronze or carved from marble. Rodin's focus was on the handling of clay. George Bernard Shaw sat for a portrait and gave an idea of Rodin's technique: "While he worked, he achieved a number of miracles. At the end of the first fifteen minutes, after having given a simple idea of the human form to the block of clay, he produced by the action of his thumb a bust so living that I would have taken it away with me to relieve the sculptor of any further work." He described the evolution of his bust over a month, passing through "all the stages of art's evolution": first, a "Byzantine masterpiece", then "Bernini intermingled", then an elegant Houdon. "The hand of Rodin worked not as the hand of a sculptor works, but as the work of Elan Vital. The Hand of God is his own hand." After he completed his work in clay,