Karel Appel Ragazzo con palla 1950. Christiaan Karel Appel was a Dutch painter, sculptor, and poet. He started painting at the age of fourteen and studied at the Rijksakademie in Amsterdam in the 1940s. He was one of the founders of the avant-garde movement Cobra in 1948.
Karel Appel’s Portrait of Theo Wolvecamp. Corneille, Karel Appel and Constant invited THeo to join the Dutch Experimental Group. This group merged later on into the international group of artists known as Cobra.