The Delaunays' friend, the poet and art critic Guillaume Apollinaire, coined the term Orphism to describe the Delaunays' version of Cubism in 1913. It was through Apollinaire that in 1912 Sonia met the poet Blaise Cendrars who was to become her friend and collaborator. Sonia Delaunay described in an interview that the discovery of Cendrars' work “gave me a push, a shock.” She illustrated Cendrars' poem "La prose du Transsibérien et de la Petite Jehanne de France" ("Prose of the Trans-Siberian and of Little Jehanne of France") about a journey on the Trans-Siberian Railway, by creating a 2m-long accordion-pleated book. Using simultaneous design principles the book merged text and design. The book, which was sold almost entirely by subscription, created a stir amongst Paris critics. The simultaneous book was later shown at the Autumn Salon in Berlin in 1913, along with paintings and other applied artworks such as dresses, and it is said that Paul Klee was so impressed with her use of squares in her binding of Cendrars' poem that they became an enduring feature in his own work.