re: working in a vacuum
The ancient Greek sculptor Polyclitus once performed an experiment where he worked on two sculptures simultaneously, one in his private workroom and one in the room where he often entertained guests. Whenever someone commented on the viewable sculpture, Polyclitus would change it as they suggested. When both sculptures were finished and showed to the public, the private one was declared a masterpiece and the public one considered an artistic disaster. When asked how the two sculptures could be so drastically different in quality, Polyclitus answered, "Because I made this one (the private one) and you made that one."