Read it through once

Not quite sure of her direction, Tess stood still upon the hemmed expanse of verdant flatness, like a fly on a billiard-table of indefinite length, and of no more consequence to the surroundings than that fly. The sole effect of her presence upon the placid valley so far had been to excite the mind of a solitary heron, which, after descending to the ground not far from her path, stood with neck erect, looking at her.