Wren bore his eighty-one years as an arch supports tons of stone. He had been a sort of mathematical and mechanical prodigy. The quicksilver that had seemingly welled up out of the ground, round the time of Cromwell, had been especially concentrated in him. Later that tide had seemed to ebb, as many of the early Royal Society men had succumbed to a heaviness of the limbs, or of the spirit. Not so with Wren, who seemed to be changing from an elfin youth into an angel, with only a brief sojourn in Manhood. He wore a tall fluffy silver wig, and clothing of light color, with airy lace at the throat and wrists, and his face was in excellent condition. His age showed mostly in the dimples of his cheeks, which had lengthened to crevices, and in the fragile skin of his eyelids, which had become quite loose, pink, and swollen. But even this only seemed to lend him a placid and mildly amused look. Daniel saw now that Wisdom had been among the gifts that God had bestowed on the young Wren, and that it had led him into architecture: a field where the results spoke for themselves, and in which it was necessary to remain on speaking terms with large numbers of one’s fellow humans for years at a time. The other early Royal Society men had not recognized Wren’s wisdom, and so there had been whispers, fifty years ago, that the wonder boy was squandering his gifts by going into the building trade. Daniel had been as guilty of saying so as anyone else. But Wren’s decision had long since been vindicated, and Daniel—who’d made his own decisions, some wiser than others—felt no trace of envy, and no regret. Only a sort of awed bemusement, as their carriage emerged from Ludgate and circumnavigated St. Paul’s church-yard, and Wren parted a curtain with one finger to cast an eye over St. Paul’s, like a shepherd scanning his flock.