Vladimir Tatlin saw his piece of architecture as a way to celebrate the success of the Bolshevik Revolution. It was to be erected in St. Petersburg (Petrograd at the time), but it never was. Hearing his plans for this structure in this day and age, it makes sense. The building was quite beyond its time in construction and technology.
The three levels were going to have one room of different sizes and shapes on each. The bottom level of a cube would be used for conferences and meetings, the middle pyramid for executive activities, and the top cylinder for press activities. Each level would rotate at a different speed respectively: a year, a month, and a day. It would be the headquarters for the Comintern.
Never having been built, it stands as a fitting testament of the Soviet mission and its failure to follow-through.