Wallpaper is a kind of material used to cover and decorate the
interior walls of homes, offices, and other buildings; it is one aspect
of interior decoration. It is usually sold in rolls and is put onto a
wall using wallpaper paste. Wallpapers can come plain (so that it can be
painted), textured (such as Anaglypta), or with patterned graphics.
Wallpaper printing techniques include surface printing, gravure
printing, silk screen-printing, rotary printing, and digital printing.
Mathematically speaking, there are seventeen basic patterns, described
as wallpaper groups, that can be used to tile an infinite plane. All
manufactured wallpaper patterns are based on these groups. A single
pattern can be issued in several different colorways.
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