We both made images of this child at work as well. You were there earlier than I was, since he has just started working on this math challenge. I came a bit later, and caught him nearly at the end of his work (http://www.pbase.com/pnd1/image/143582466 ). Note that he seems a bit more tentative in your image than in mine. As he worked out the problem, he seems to become ever more confident in his own abilities.
