This book presents a comparative study of two pairs of collaborative artists who worked closely with one another. The first pair, Cézanne and Pissarro, contributed to the emergence of modern art. The second pair, Johns and Rauschenberg, contributed to the demise of modern art. In each case, the two artists entered into a rich and challenging artistic exchange and reaped enormous benefits from this interaction. Joachim Pissarro’s comparative study suggests that these interactive dialogues were of great significance for each artist as well.