This is an exceptional circumstance, but in general, nothing prevents a urinal, or any object for that matter, to be an art piece, if it matches the goals of that particular exhibition. Similarly, undies can qualify as artwork, if they are a match to the exhibition. You can theoretically submit your undies after reviewing the exhibition terms and considering that it is a good match. In general, the selection committee will select the pieces based on the exhibition's goals.
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