when the sky is as grey as this - impeccably grey, a denial, really of the very concept of colour - and the stooped millions lift their heads, it's hard to tell the air from the impurities in our human eyes, as if the sinking climbing paisley curlicues of grit were part of the element itself, rain, spores, tears, film, dirt. Perhaps, at such moments, the sky is no more then the sum of the dirt that lives in our human eyes.