Raoul Dufy in his studio preparing to paint the fresco La Fée Electricité for the 1937 Exposition Internationale in Paris (Photograph by Roger Schall, 1936) - The massive fresco included a great deal of technical innovation, documentary research and solid work - he painted models nude and then in costumes, transferred drawings onto tracing paper in order to work out how to group them, then projected them life-size onto the panels with a magic lantern - ...