Bright pink birds facing each other with their beaksBright pink birds facing each other with their beaks
Wallpaper of green-kolichnevogo dark color with lozenges and crossesWallpaper of green-kolichnevogo dark color with lozenges and crosses
A desktop in minimalism with the texture of a fabric templateA desktop in minimalism with the texture of a fabric template
Textured stone wall. an old stone. desktop backgroundTextured stone wall. An old stone. Desktop background
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..