We have named PROUN [the art, stepping over from painting to architecture] a station on the path to the construction of the new form... From being a simple depicter the artist becomes a creator (builder) of forms for a new world — the world of objectivity. This does not mean the creation of a rivalry with the engineer. Art has not yet crossed paths with science.

'Theses on the 'PROUN': from painting to architecture' (1920)