The "Endless Column" stacks 15 rhomboidal modules, with a half-unit at the top and bottom, making a total of 16. The incomplete top unit is thought to be the element that expresses the concept of the infinite. Brâncuși had experimented with this form as early as 1918, with an oak version now found in the collection of the Museum of Modern Art in New York City. The modules were made in the central workshop of Petroșani ("Atelierele Centrale Petroșani"), assembled by Brâncuși's friend engineer Ștefan Georgescu-Gorjan (1905–1985), and completed on 27 October 1938. All 16 rhomboidal modules accumulate a total height of 29.3 m.