The Metaphysical painting (Pittura Metafisica) phase in Morandi's work lasted from 1918 to 1922. This was to be his last major stylistic shift; thereafter, he focused increasingly on subtle gradations of hue, tone, and objects arranged in a unifying atmospheric haze, establishing the direction his art was to take for the rest of his life. Morandi showed in the "Novecento Italiano" exhibitions of 1926 and 1929, but was more specifically associated with the regional "Strapaese" group by the end of the decade, a fascist-influenced group emphasizing local cultural traditions. He was sympathetic to the Fascist party in the 1920s, although his friendships with anti-Fascist figures led authorities to arrest him briefly in 1943. From 1928 Morandi participated in some of the Venice Biennale exhibitions, in the Quadriennale in Rome and also exhibited in different Italian and foreign cities.