Ping list, here we go.
Art Ping. Let Sam Cree or me know if you want on or off this list.
http://www.freerepublic.com/focus/f-chat/1419876/posts on Cezanne and van Gogh
http://www.freerepublic.com/focus/f-chat/1427099/posts on the development of Cubism
You are right, all of this began in the nineteenth century, although some might even say that the flattening process (which ultimately led to Picasso and Pollock) began with Manet and his Picnic.
I did just see Pollock's One at the Museum of Modern Art, and the power in his large, great pieces never ceases to amaze me. Not all of them are great, but when he strikes it right, it is wonderful.
When I was there, a German couple were also sitting on the bench, studying it and discussing it in German. I wished I'd understood what they were saying.