Juan Gris , ‘Le livre’, 1915, oil on canvas, 73 x 60 cm / Estimate £12,000,000 – £18,000,000 – christies.com / L’Esprit Nouveau © Quentin Laurens Archives. Gris at the Place Ravignan in 1917 © Quentin Laurens Archives. Photo of Juan and Josette Gris © All Rights Reserved