A piece of art that I found to be valuable is the loch ness monster made from trash bags and is setup in the streets of New York.  How this artist, Josh Allen Harris, sets his work apart from other artists of today is the fact he uses the elements of New York City such as subway vents to bring his art to life.  Harris' artwork is very valuable because he makeshifts trash bags to become animated creatures.  He lets people view his artwork without charge, and I believe the art is valuable somewhat based on the fact that a buyer of art could not necessarily buy this art piece and make it look magnificent in ones own home, such as it does on the streets of New York City.