When the Martians had built the village of Kinkaaka there had been water in the canal, a cool, level sweep of green water from the northern icecap. Now there was none, and Kinkaaka clung to the upper swell of the bank and curved its staggered residential terraces like tragic brows over the long slope of sand and clay, the dead wall baked criss-cross by the sun, that bore at its deep juncture with the opposite bank the pitiful, straggling trench cut by Mars' last moving waters an untold time ago.