Dear Sophie -
RICHTER published a book titled "Atlas" which is a compilation of the various newspaper clippings, photos and sketches which are source materials for his work. His content ranges from the political to the personal. His paintings defy classification as they are at times abstract, photographic, and often blend photography with paint.
You saw a beautiful Richter at The Cleveland Museum of Art yesterday. (that warranted a better installation than the hallway!).
With love,
Mom