I t doesn’t work,” Roy said loftily from the front seat. Peaches was indignant. “Yes it does!” she shouted from behind us. “My friend was drawing mustaches on people with his and you could totally see them when you shined the light on them.” Roy lined his head up with the back of his seat so as to conceal his movements from his sister, then slowly shook his head in stubborn dissension. It is book fair time at the elementary school and while there are books there, sure, there are plenty of other items that seem—for the week at least—to be essential to the happiness of eleven and under set. Things like erasers that look like iPhones, pencil sharpeners rendered in the image of…