I just played around (in my mind) with the BW version. First, I removed the chair, which immediately destroyed the balance of the image.
Then I put it back and looked around some more.
Some of my discoveries included the way the "colored" squares are echoed by the menus on the wall behind them, and the stripe near the floor below the squares, and the windows. Almost everything in the background is rectangles and straight lines.
Then I noticed that the only rounded objects in the scene are the boy's head, the back of his chair, the back of the empty chair in front, and the small coil of wire in the background. The effect, for me, is to tie these elements together, and the empty chair really emphasizes what Russ said: That the boy was in his own world.
Then, for the first time, I noticed the little word "gone" just above the boy's head! Wow!
This now works for me on so many different levels. I really like images that give me something more each time I look at them. This one is right up there with the best, IMHO.
Nice work, Russ!
Eric