After World War I, constructivist ideas were adopted by artists in other countries, including Czechoslovakia, Hungary, and Poland. In Czechoslavakia, __________ became the leading supporter and practitioner of functional design. He advocated the constructivist ideal and the application of design principles to every aspect of contemporary life. His book jackets and editorial designs evinced an organizational simplicity and typographic clarity, giving graphic impact to the communication. A good example is the 1929 cover design for Getting Married, in which a triangle creates a strong focal point, unifies the silhouetted figures, and becomes the main structural element in a delicately balanced composition.