File:HermesPan.jpg

Summary
RKO Publicity photo of Fred Astaire (left, on chair) and Hermes Pan (kneeling) during rehearsals c.1937

Note that the drawing on the blackboard was an invention of the publicity dept. whereas Astaire and Pan never used such diagrams in their work. Astaire voiced his contempt for the blackboard by adding some marks and, when Pan asked what they meant, he replied "That's the horseshit" (cf. Bob Thomas: Astaire, The Man, The Dancer. Wiedenfeld and Nicholson, London, 1985 pp.125-126). The photograph also illustrates this in-joke.