India, Feb. 12 -- The Amar Colony shop is shuttered at the moment. Being mid-morning, the sun has already risen. A small triangle of gold light is glistening on the shop's corrugated metal shutter. In that fragment lies a persistence and fragility. Delhi's daylight turns exceptional twice a year. In October, after the monsoon clears the sky, and before the winter smog arrives. And now, in February, after the cold haze lifts, and before the summer dust could alter the texture of the air. The daylight becomes almost glassy. You cannot notice this light by looking up at the sun. It is perceived where it is interrupted-on walls, cloth, stone. Then the light breaks into a pattern, showing its creative powers. Let's begin the tour with a monkey-r...