"Rack 'em Up" is a complete set of billiard balls that have been made into kaleidoscopes.  These were created by Brett Bensley.  Each of these little scopes has a dry, non-turning object cell and they all create different 3-mirror images.  The set comes with a wooden billiard ball rack to display the balls.  Each of the billiard balls is inscribed "B. Bensley '00 57".