 None of them knew the color of the sky . Their eyes glanced level , and were fastened upon the waves that swept toward them . These waves were of the hue of slate , save for the tops , which were of foaming white , and all of the men knew the colors of the sea . The horizon narrowed and widened , and dipped and rose , and at all times its edge was jagged with waves that seemed thrust up in points like rocks . 
