Seen from Thames Street the river had seemed less Conduit than Barrier—a palisade of honed wood thrown up to prevent an invasion, or an escape. But with a few strokes of the waterman’s oar they penetrated the screen along the wharves and surged out into the main channel. This was as crowded as any water in the world, but miraculously open and accommodating compared to the streets of London. Daniel felt as though burdens had been lifted, though nothing could be further from the truth. London very quickly became a smouldering membrane, a reeking tarpaulin flung over the hill and not smoothed out. The only features of consequence were the Fire Monument, the Bridge, the Tower, and St. Paul’s. The Bridge, as always, seemed like a Bad Idea, a city on stilts, and a very old, slumping, inflammable Tudor city at that. Not far from its northern end was the Fire Monument, of which Daniel was now getting his first clear view. It was an immense solitary column put up by Hooke but universally attributed to Wren. During Daniel’s recent movements about London he had been startled, from time to time, to spy the lantern at its top peering down at him from over the top of a building—just as he had often felt, when he was a younger man, that the living Hooke was watching him through a microscope.