Primum Mobile contains screen-prints of line drawings, handwritten notes and definitions. Sources of inspiration are Walters MS73, Byrhtferth's Diagram, the Ptolemeic, Tychonic, and Copernician solar system models found in Astronomia Nova, by Johannas Kepler, constellations in Didereus Nuncius, by Galileo Galilei, and imagery from 20th Century astronomy guidebooks. As in related artist's book Nebula, imagery comes apart as pages of the book are turned and comes back together as the viewer looks to the verso of each page. One element of an image is printed on each page. Each line drawing is accompanied by a related term, with notes and poetic definitions regarding the term. The text is interspersed throughout the drawing it accompanies. As one pages or flips through the book, illustrations are simultaneously deconstructed and reconstructed, text is visible but not always legible. The book serves as a reflection on how information evolves.