Jack looked over the railing and saw the filament plunge down and away toward the east. He lost track of it in the Monument’s shadow. But he could see a lot of boyish ferment on the roof of the Church of St. Mary-at-Hill, five hundred feet away: some leaping, some hopping into the air, some hurling of stones with strings tied to ’em. To any observer who did not know, as Jack did, that a thread of silk was floating in the air a few yards above these people’s heads, it would have looked like the cavorting of men and boys made mad by witchcraft or syphilis, a kind of Bedlam al fresco.