Biographical research into the subjects' lives led Kl ver to focus on the summer of 1916 as the likely time the photos were taken. He then measured buildings and plotted angles and lengths of shadows in the photographs to narrow the time frame to a spread of three weeks. Further investigation eventually allowed Kl ver to identify the photographer as Jean Cocteau and to determine the day that Cocteau had taken the photographs: August 12, 1916. A computer printout of the sun's positions on that date, obtained from the Bureau des Longitudes, together with the length of the shadows, enabled Klver to calculate the time of day of each photograph, and thus to put them in proper sequence.
In a tour de force of art historical research, Kl ver then reconstructed a scenario of the events of the four hours depicted in the photographs. With evocative attention to detail--noting when Picasso is no longer carrying an envelope or Max Jacob has acquired a decoration in his lapel--Kl ver recreates a single afternoon in the lives of Picasso and friends, a group of remarkable people in early twentieth-century Paris.
Besides the central "portfolio" of photographs by Cocteau, the book contains additional photographs and drawings, short biographies of all the subjects, and a historical section on the events and activities in the Paris art world at the time.