// init
#declare trans_value = 50;

#while (<some test here>)
  #declare trans_value = 50 - trans_value;
  object { <good object here> translate <trans_value,0,0> }
  #end  // end while

assuming the bricks are line-up to x axis..

-- 
FD aka Freddy D. aka Prof D.
Pro### [at] wanadoofr
http://profd.est-ici.org

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