From the early 40’s he started to paint with poor materials, he is the first abstract sculptor, head of the artists that revolutionezed the years of 1900 , an absolute international artist. Working with dinamical geometric-abstract shapes, using materials like terracota, plaster and cardboard , colored and scraped. After World War II, the „poetry „ of Mastroianni reuses the echoes of plastic dinamism of Boccioni’s descendence . Some of his works , that were immediatly done after WWII are conserved at the Modern Art Gallery of Roma, Tate Gallery in London and Salomon Guggenheim Museum in New York. His research has a direct connection with the futuristic period, Brancusi’s cubism , John Arp’s and Henry Moore’s plastics, but keeping os own personal dinamycs , characterized through intense lines and structures, a generative nucleum where gestures are trapped in the haviness of materia. The works of Umberto Mastroianni can be found in more than 280 museums all over the world.