If a painting falls off the wall in an abandoned museum does it make a noise?

My personal feeling on art is that anything can be a work of art to someone for any reason they have.  It is somewhat of a 'beauty is in the eye of the beholder,' theory.  But once I started reading The Nature of Art by Thomas E. Wartenberg for class I realized that every theory is questioned.  So I would like to pose a question for not myself and anyone who reads it... If a well known artist were to paint a mural on a wall in a private room that they never allow anyone in is the mural still a work of art?  It is in the eye of the beholder (the artist) but no one else can see it.

Thanks for reading!
Zach