 Functionality and social effectivity were the main characteristics of his works, which have to be implemented by the modern being in order to create a world of social equality.His works include concrete poetry, billboards, design, novels, and paintings, and were influenced by Expressionism, Dadaism, Futurism, Surrealism and Constructivist tendencies.Képarchitektúra, or Image Architecture was first defined in pamphlet by Kassák in late 1921.