this is. >> this is a great drawing brought by alfred stieglitz from paris to new york.shown in his gal reurbgs all the artists here look at it puzzled, amazed, begin to work in a similar vein because they're going to patience, seeing what the new developments are. and in 113 it's already... has works by american and europeans that are reflections of this kind of cubism by picasso, this drawing was reshown. so a key work in the history even in the arc of our country america. >> rose: would it say something like a fire escape and not a good one? >> it was derided and if you think of the most sensational paintings and nude descend ago scare case which was called an explosion in a single factory. that nude descending staircases is almost a plagiarism of this drawing by picasso. >> rose: in 1915. >> this is one of the most beautiful of the naturalistic drawings by picasso. done after a photograph as so many works by picasso were. this is only beginning to understand the impact of photography on picasso. not only was he an avid photographer and that he used that as an aid for