My son is a very logical thinker and practically all his pictures involve mazes or some sort of problem-solving task, not always obvious to the observer. It's a personality trait. He loves chess, chinese checkers, monopoly & any type of strategy game. His teacher gave him a "C" for this picture because she couldn't understand it without his explanation and the picture had to be crystal clear. Excuse me, but what do you expect when you give kids a topic like this? She wanted something more along the lines of a house, trees, birds, flowers, etc.
I told my son not to worry because I was ever so proud of the creativity put into this thought-provoking drawing.