three glass-shaded lights hung down over this dinosaur , and when thad turned on only these lights , as he did now , the savage , overlapping circles of light they made on the desk 's littered landscape made it seem as if he were about to play some strange version of billiards there - what the rules for play on such a complex surface might be it was impossible to tell , but on the night after wendy 's accident , the tight set of his face would have convinced an observer that the game would be for very high stakes , whatever the rules .