"Dropping a Han Dynasty Urn" by Ai Weiwei

Must art always be constructive (meaning to make something) OR can it sometimes also be destructive (meaning to destroy something)? Is one more expressive than the other? What might it mean to destroy an artifact others have said is an "important" part of your cultural heritage? Are there any things in history museums you would rather see smashed at your feet than looked at behind glass?

Controversial and highly political Chinese artist Ai Weiwei challenges his identity as a Chinese citizen and the power of today's anti-free speech Chinese government by smashing a very old and very valuable piece of Chinese history. What might the gesture/action mean? Can you think of an expressive action you could do to defy the people of power in your life (parents, teachers, government, etc.)?