Then define the edges of the borders each side of the tree, maybe deepening them and curving them inwards each side.

I put one foot in front of the other, and the edge of the building curved around us.

Below him the sunlit surface of a world spread out, its edge already curving, cloud-masses and green-clad plains.

They turned back toward the sun as the forest's dark edge curved around.

Its edges still curved away astonishingly, and the ring mountains were amazingly distinct.

The edges of her mouth curved slightly upward in the beginnings of more laughter.

The edge of the Blast Event crater curved toward them as they made directly toward a hill in the distance.

Its edges still curved away beyond a surprisingly nearby horizon.

On either side of the outer doors lay another tufa-paved well, inner edge curved.

As the mushroom matures, the shape of the cap becomes more conical or convex, and finally flattens out, with edges curved upward.