Oh, BTW, there is a front wall to the box containing the balls.  It was 
glass initially, but I thought it was in the way since it was the balls I 
was interested in, so I made the front wall invisible.  The balls have been 
stacked with a random xz offset smaller than 1/1000 of their radius.  My 
physics engine doesn't introduce randomness so if the balls were stacked 
perfectly lined up they wouldn't have fallen.  The very slight offset, 
gravity and time do the work.

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