We talked about how Degas "discovered a world of space in the peculiar margins of perspective conventions" that others had noticed but not used in their art (A Fine Disregard, K. Varnedoe, Harry Abrams, Inc.). Volumes have been written about how Van Gogh, Gauguin, and others were greatly influenced by Japanese prints, primarily those of Ando Hiroshige. But Varnedoe thinks that artistic influence went in the circle.
Here's Plum Estate

While Varnedoe provides a lot more background than I have room for here, much of what he says boils down to this: "The tradition in which One Hundred Famous Views of Edo was made was a tradition of Japanese engagement with Western perspective."
He cites a book by historian Henry Smith who points out "long before there was Japonisme in Europe, there were waves of European influence in Japan." The first wave was in the 1600s, primarily with religious art. The second wave was in the 1730s and included Dutch books with interior views, landscapes, and anatomical charts. He believes the Japanese were fascinated by perspective and began to copy, but without understanding all the principles.

Some Japanese artists, like Shiba Kokan, produced "fully perspectival views," but others felt free to splice together aspects of perspectival systems, resulting in images that have figures, objects or still life grafted onto scenes depicting deep space. (pages 56-57)
It's Varnedoe's theory that as these Japanese artists experimented, they solved problems in their own ways and became quite inventive in their rather flexible approach to perspective.
"One solution to the problems Hokasai had. . . was to give up on the ideal of a continual recession into space." (p. 57) Notice the splice of foreground directly over the background view of Fuji in his famous The Great Wave off Kanagawa.

By the time you get to Hiroshige, working later than Hokusai, you're noticing some comic inventions with perspective, such as Naito Shinjuku, Yotsuya, in which the horses hindquarters are looming in the foreground. (Apparently Shinjuku was a brothel area outside Edo, and poetry going back decades mentioned the mixing of two aromas - perfume of the courtesans and odor of the horse manure.)

Below is Degas' Racecourse, Amateur Jockeys (1876), with Hiroshige's Ushimachi, Takanawa beneath it.


Varnedoe is not suggesting that the Europeans simply copied the Japanese, but that perhaps a number of things were brewing at once (including some borrowing from the earlier Realist tradition). He thinks the Europeans, and Degas in particular, were more than responders, inventing in their own way, and that Degas was constantly moving figures around, taking a figure from one painting, a staircase from another, and trying something new every time he made a picture. He thinks that Degas and others probably figured out the same things the Japanese did - "that you do not have to construct space as a deep stage and coherently organize everything to fit consistently into it; if you layer together little and big elements, foreground and background parts, and leave out the transitional middle ground, the viewer will use these clues to fill in the binding, overall space."
Here's The Ballet from 'Robert Le Diable' (1876) - only foreground and background!

In fact, Varnedoe points out that Degas had been splicing elements together for years, as early as this painting, Woman Leaning Near a Vase of Flowers, 1863.

Of course, there's much more in A Fine Disregard but I fear I'm running on too long.
He discusses the innovative compositions of Munch, Caillebotte, and Gauguin, all taking bits and pieces of conventions which they were now familiar, and rearranging them in new ways to make paintings that produced a different world view, a different mood, or a new way of looking at the individual in society.
Maybe Gauguin and Matisse deserve a day, and then that will be enough on his ideas about the "road to flatness" and what makes modern art modern.
Time to start work on a horse's hindquarters series. . . actually I have an opening reception today for an exhibit so I need to get out the door. Looking forward to hearing your thoughts.