being an art student in high school, i do belive it is art. defining if a certain piece, object, etc is art is a hard topic. take abstract. to most people there is little difference to what an artist does verus what a kindergartner can do. there are "partial rules" to art, i.e. color, value, shape, form, etc. most modern art follows these rules. another example is minimalism art which is art that is rather minimal in design. it could be a canvas with only one soild color on it, or it could be a scupture of a cube. but the amount of effort and time put into the piece is what can separate art from "kids work". this type of art movement that Creed is part of is common. i forgot the actual name of it though, since that is not my style. anyway, it usually is built and either photographed and/or put on as part of an art show. some think it is art, some don't. that could be a matter of opinion, but most artists will call what Creed did art. no one ever said art is just about paintings!
check out my sites (all are under major construction):
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http://cordovajcl.port5.com - the cordova high school junior classical league website
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http://chsart.port5.com - student art center
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http://philmont.port5.com - my Philmont and scouting adventures