Of the many things that are never done in life, paintings go on the list. How many times can I take a painting off the wall and do "just one more thing" I am not sure there is a limit. only a limit to my wanting to fuss with that painting. but even that isn't really limitless. bring me back to that painting in a day, week or year and I will want to fuss with it some more....
at least paintings are pretty even when they are not done. unlike dishes.... if only dirty dishes in the sink could be more like a painting...