There's a black mass of rock standing out like a buttress just to the west of the little harbour, running right into the sea, and going down straight like a wall into the deep clear water at its foot, as if to say to the waves, "Thus far may you come, and no farther."  For hundreds upon hundreds of years the winds and tides have combined to rid themselves of this obstacle to their progress, the winds urging the waves that come rolling in from the vast Atlantic, gathering force as they increase in speed, like one rushing at a leap; and at last leap they do, upon the great black mass of shale, tons upon tons in weight, seeming as if they would sweep it clear away, and rush on in mad ruin to tumble the fishing luggers together and shatter them like eggs as they lie softly rubbing together in the harbour.