an incomplete work. It was a rhythm, much similar to the rhythmic styles of Pollock, that relied on the mathematical interlocking of planes that created a work freely suspended in air. Tatlin's Tower or the project for the 'Monument to the Third International' (1919–20), was a design for a monumental kinetic architecture building that was never built. It was planned to be erected in Petrograd (now St. Petersburg) after the Bolshevik Revolution of 1917, as the headquarters and monument of the Comintern (the Third International). Tatlin never felt that his art was an object or a product that needed a clear beginning or a clear end. He felt above anything that his work was an evolving process. Many artists whom he befriended considered the mobile truly complete in 1936, but he disagreed vehemently. Alexander Rodchenko Russian artist Alexander Rodchenko, Tatlin's friend and peer who insisted his work was complete, continued the study of suspended mobiles and created what he deemed to be "non-objectivism". This style was a study less focused on mobiles than on canvas paintings and objects that were immovable. It focuses on juxtaposing objects of different materials and textures as a way to spark new ideas in the mind of the viewer. By creating discontinuity with the work, the viewer assumed that the figure was moving off the canvas or the medium to which it was restricted. One of his canvas works titled Dance, an Objectless Composition (1915) embodies that desire to place items and shapes of different textures and materials together to create an image that drew in the viewer's focus. However, by the 1920s and 1930s, Rodchenko found a way to incorporate his theories of non-objectivism in mobile study. His 1920 piece Hanging Construction is a wood mobile that hangs from any ceiling by a string and rotates naturally. This mobile sculpture has concentric circles that exist in several planes, but the entire sculpture only rotates horizontally and vertically. Alexander Calder Alexander Calder is an artist who many believe to have defined firmly and exactly the style of mobiles in kinetic art. Over years of studying his works, many critics allege that Calder was influenced by a wide variety of sources. Some claim that Chinese windbells were objects that closely resembled the shape and height of his earliest mobiles. Other art historians argue that the 1920s mobiles of Man Ray, including Shade (1920) had a direct