Although I can't say it covers all of the things @stonebat mentions, I think anyone who's played around with recreating musical instruments using sampling, where in theory you can create something perfect and consistent note-to-note, will have discovered that you have to build imperfection into it to make it sound more "real" and human, because real, human produced things have that quality - whereas mass-produced, perfect things, often don't. But it's also interesting - we strive for perfection but often really what we value is imperfection.
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