View of the flowing sea surface beyond the edge of the evening horizon, two lonely rocks look at each otherView of the flowing sea surface beyond the edge of the evening horizon, two lonely rocks look at each other
The rays of the setting sun gliding across the water surfaceThe rays of the setting sun gliding across the water surface
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..