far up , so far he had to squint to see , was its face : nose like a precipitous slope that he could ski on ; nostrils and ears like caves into which he could climb ; hair a forest he could lose himself in ; mouth a vast , shut cavern ; teeth ( the giant grimaced suddenly ) he could slide an arm between ; eye pupils the height of him , black irises wide enough to crawl through , lashes like dark , curling sabers .