A puff of wind (in spite of the heat, there was quite a wind) blew a thin black veil over the sun and over the Strand. The faces faded; the omnibuses suddenly lost their glow. For although the clouds were of mountainous white so that one could fancy hacking hard chips off with a hatchet, with broad golden slopes, lawns of celestial pleasure gardens, on their flanks, and had all the appearance of settled habitations assembled for the conference of gods above the world, there was a perpetual movement among them. Signs were interchanged, when, as if to fulfil some scheme arranged already, now a summit dwindled, now a whole block of pyramidal size which had kept its station inalterably advanced into the midst or gravely led the procession to fresh anchorage. Fixed though they seemed at their posts, at rest in perfect unanimity, nothing could be fresher, freer, more sensitive superficially than the snow-white or gold-kindled surface; to change, to go, to dismantle the solemn assemblage was immediately possible; and in spite of the grave fixity, the accumulated robustness and solidity, now they struck light to the earth, now darkness.