At the tip of Cairo two great rivers finish their long argument and become one, and the levee grass down at the point holds the last light after the town has gone still. Waterfront Services Co works the lawns behind those floodwalls — mowing, trimming, edging, and clearing off what the wind and the water leave behind. Summer this far south is Southern in its heat and its slowness, and the grass answers accordingly. Magnolias and cypress make a litter all their own, and it gets raked up and hauled out. A freshly cut lawn in Cairo, with a towboat sliding past below the wall, is a good thing to stand and look at.