// Create 10 balls along X axis, from 0 to 9
#declare BallCount = 0;
#while (BallCount < 10)
  sphere {
    <BallCount,0,0>,  // NOTE: <0,0,0>, <1,0,0>, <2,0,0>, etc.
    0.5
  }
  #declare BallCount = BallCount+1;   // increment our counter
#end