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In the period 1925-26 he met Ludovic Janssen and the landscape painter Richard Heinz in Liège. Together with them he undertook trips through the Kempen. There he also met Maclot and Emile Van Doren. In this impressionist period, Noldus mainly painted landscapes and cityscapes. After the Second World War he traveled through the Ardennes, Kempen and Haspengouw with the Tongeren artist Jaak Savenay. His snow landscapes were typical for this period. He also met Leo Weltjens who accompanied both artists on the nature tours. In the early 1950s, the impressionist period ended for the time being and evolved into expressionism. He was also now involved in figure painting such as self-portraits, mother and child, etc. Paul Noldus now painted still lifes in addition to landscapes. The influence of cubism and abstract painting also became apparent in the works of the 1960s and 1970s. At the end of 1960, an overview of his works was shown in the Gallo-Roman Museum. There were about 25 works on display. A retrospective exhibition followed in 1969 in Roermond. Many considered this event a breakthrough