Dune creep

The great sand mound grew steeper still.

But sand-storms howled it unstable.

Then a section sheared from the slope.

The slope's angle change checked the fall.

Sand-falls slid into each other,

like the parts of a telescope.

Avalanche begot avalanche.

The boomings startled the desert.

The earth trembled in loud slow beats.

The rupture cut a straight slip-face,
sliced clean by the axe of some giant.

Sands blown over the brink fell there.

So extremities grew like limbs.

The winds compel the dunes to creep.