There was no cultural or economic incentive for artists to exhibit impressionistic works like these, and in any case, painters usually regarded them as no more than means to the end of producing set pieces for public display, which required a distillation of experience and a degree of finish that open-air sketches simply could not supply. That is why all of Turner's impressionistic oil studies and most of Constable's wonderful oil sketches remained in their creator's studios throughout their lifetimes - the art audience of the day would have regarded them as unfinished notations, if not mere daubs.
- Impressionist London by Eric Shanes
I cannot wait to see this film: