When young Pablo Picasso arrived in Paris in October 1900 he made his way up the hillside of Montmartre ... The real revolution in the arts first took place not, as is commonly supposed, in the 1920s to the accompaniment of the Charleston, black jazz and mint juleps but more quietly and intimately, in the shadow of the windmills-- artificial and real-- and in the cafes and cabarets of Montmartre during the first decade of the century. The cross-fertilization...