it was as if a great animal had awakened some miles away , and its purring made the earth resonate ... or as if every single bulb inside a hundred-story building just over the horizon had just gone on , making a blaze of light strong enough to conceal the stars ... or as if someone had switched on the biggest magnet in the world , which was tugging at jack 's belt buckle , at the change in his pockets and the fillings in his teeth , and would not be satisfied until it had pulled him into its heart .