After fighting in the first World War Guiette started painting as an autodidact in 1919. He was inspired by the art of his time and started a thorough study of the plastic form. He was influenced by the Flemish expressionism and signed a contract with the gallery of Paul-Gustave Van Hecke. Under the influence of Picasso his work evolved to a more cubic inclination. Around 1947 his work was related to the so-called ‘art brut’. The material becomes an important element to represent primitive forms which continuously evolve to more characters. From 1955 onward the works of Guiette become informal. The character becomes a more and more calligraphic symbol that in the 1960’s and later shows the influence of the zen-philosophy.