After leaving [the International Exposition in Paris, with a lot of new machines], I went to see Courbet's exhibition; he has reduced the admission to ten cents. I stay there alone for nearly an hour and discover that the picture [ 'L'atélier' / the Painter's Studio - 1855] of his which they refused [for exposing on the official Salon in Paris ] is a masterpiece; I simply could not tear myself away from the sight of it.