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I ease myself along, intrigued by the smooth, waterworn walls.

They consist of waterworn chunks of bright turquoise Styrofoam adorned with a feathered plume or two — lightness reinforces lightness.

Sometimes we went through deep cuttings in the red clay, close enough for me to notice it was interstratified with waterworn but angular quartz peebles.

After a death a long waterworn stone is usually placed in one of the old dolmens which are scattered over the Nilgiri plateau, but occasionally a small dolmen is raised to mark the burial.

Rounded waterworn pebbles and cobblestones among a mass of angular bowlders, left behind by glacier streams, together with an occasional striated pebble, were “sermons in stones” to the geologist.