Last year, I offered the following definition on Wikipedia:
"A sculpture is a three-dimensional, human-made object selected for special recognition as art."
And it still hasn't been edited away -- so I guess everyone is happy ?
On the other hand -- my definition of art as "Whatever you want it to be, sweetheart" --- was judged unacceptable by just about everyone.
(BTW - I also did the Wikipedia sections on the sculpture of China and the United States)