The walls were marked with what his eyes first took to be the grooves left behind by a careless plasterer's trowel, but as his pupils dilated, he understood that Mr. and Mrs. Clarke's boarders had been drawing on the walls, apparently with bits of charcoal fetched out of the grate. It was plain to see which pictures had been drawn by whom. Most were caricatures learned by rote from slightly older children. Others – generally closer to the floor – were maps of insight, manifestoes of intelligence, always precise, sometimes beautiful. Enoch had been right in supposing that the boy had excellent senses. Things that others did not see at all, or chose not to register out of some kind of mental obstinacy, this boy took in avidly.