Shangri La was a modern myth propagated by self-serving mystics, cranks and a best-selling British writer, but one cannot blame the urge to imagine a mountain arcadia when confronted with the snowy peaks that gather around Kalpa, Reckong Peo, Nako (Lake) and Spiti in timeless, insouciant majesticity. In the Satluj valley in Himachal Pradesh’s Kinnaur district, the verdure contrasts with the intensely blue sky mottled with great sails of clouds, as the great western Himalayas recede in ragged, circular waves, from brown to grey-blue.