YES - Sharon nailed it.
From Harold Speed,
"The Practice and Science of Drawing," look up page 71 where he talks about "dither" or the play that is necessary in a mechanical engine for it to work.
Quote:
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The piston must be allowed some play in the opening of the cylinder through which it passes, or it will not be able to move and show any life. The word "dither" will be a useful name to give that elusive quality, that play on mechanical accuracy, existing in all vital art. It is this vital quality that has not yet received much attention in art training. It is here that photography fails, it can only at best give mechanical accuracy, whereas art gives the impression of a live, individual consciousness.... It is the subtle differences in the individual renderings of nature that are the life-blood of art.
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