Cornelia Parker- Art and the Quotidian

Last year I was lucky enough to see Cornelia Parker's 'Thirty Pieces of Silver' (mentioned in 'Art and Today') at the Tate modern. It was a very beautiful overwhelming installation, and after reading 'Art and the Quotidian Object' got me thinking about how we place meaning and value on artworks. Had these pieces of silver been sitting perfectly unbroken in a shop, one wouldn't pause to notice them. However now that they have been purposely bent and crushed beyond repair, and hung in a prestigious gallery, suddenly they have a meaning, a history and a value beyond their original price tags. I guess I'm wondering when it is these objects change. Is it once the artist has purchased them with the intention to change them, is it the instant they are physically altered or is it when they are hung in a gallery and given a title?

http://www.tate.org.uk/servlet/ViewWork?workid=26446&searchid=23539&tabview=text