The Gradation of the Ravines

Your shoes imprinted by the trail,
Like water itself worn by abrasive
Grains that saturate, the stones engrail —
Concave, convex, the carver and carved trade places.

A rill is never merely; a groove is a mere;
The vernier light’s so superimposed that scenes
Stand ranked in the gradation of ravines,
And dunes whose scale the sea’s vast curvature effaces
Still mark their expanse on increments of a sphere.