I was thinking about an abacus for this challenge--good idea. I like the dark background and the lighting; I think it could have been made more interesting perhaps by spreading out the balls as if a calculation were being performed.
Just one yellow or green bead down the other end would have made this an outstandin shot compostion wise. It would have added motion and tension and give the eye something to look at well as break up the ladder effect caused by the shadows and rods. Gave you a 9