A balanced life

Along the waterfront in Sausalito there is a man who spends his days balancing rocks, one on top of another.  They are simply balanced; he has a sign that says "No Glue."  He works very diligently at it:

I am not sure what value he gains from this pursuit.  He certainly is not collecting money.  I guess he does it for the peacefulness - it is a beautiful setting.  


Here is one final result:

Intriguing.