ed - once you work out for yourself what art really is, all the rest will fall into place one way or the other - but only you can do that.
as for scenario 3:
http://www.edwardmitterrand.com/artists/Sugimoto/indexarchitectures.php
done and done well (as have most of your other scenarios - some many times over).
Duchamp appropriated the urinal - if you get that, the rest will make sense - even if you don't agree or dislike it.
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