There’s awe-inspiring immensity down there. I’m looking out over Mexico City, from thirty-six floors up in the sky, a recumbent giant right before me, shimmering in glorious February sunshine. It’s a miracle I’m here, shacked up in this lux hotel for a few days. Behind triple-glazed glass, I can’t hear a thing; but what a sight to behold, to conjure with. Down below I can see the great green expanse of Chapultepec, sliced apart by Paseo de la Reforma and criss-crossed by the enormous multi-tiered expressway—Circuito Interior—over in the distance, gridlocked with traffic. It looks like the traffic passes beneath a rollercoaster, even passes into this rollercoaster, looping the loop. The city all around seems only to end at the horizon, at the foothills of faraway mountains beyond; at times Mexico City even seems to stretch beyond that horizon, beyond anything as-yet recognisable, as if it’s already staking out some…