Eiffel Tower (Delaunay series) stylistically between the artist's "Saint-Séverin" series and "Windows" series. Delaunay's Eiffel Tower series is evoked in architectural paintings of other iconic buildings by his contemporary, the New York artist John Marin, in his "Woolworth Building, No. 31" of 1912, and later by the Ontario artist Greg Curnoe's "CN Tower" series of the 1970s and 1980s. The 1913 artist's book "La prose du Transsibérien et de la Petite Jehanne de France", a collaborative work between Sonia Delaunay and the poet Blaise Cendrars, forms an epic narrative of a Trans-Siberian Railway journey that concludes in Paris at a Simultanist Eiffel Tower. They
Eiffel Tower gaps in the latticework. In the years since it was completed, engineers have put forward various mathematical hypotheses in an attempt to explain the success of the design. The most recent, devised in 2004 after letters sent by Eiffel to the French Society of Civil Engineers in 1885 were translated into English, is described as a non-linear integral equation based on counteracting the wind pressure on any point of the tower with the tension between the construction elements at that point. The Eiffel Tower sways by up to 9 centimetres (3.5 in) in the wind. When originally built, the first