Since the 1980s significant advances have been made in the manufacture of picture glazings, creating a much broader range of options in both glass and acrylic products. If the art in the frame is considered dispensable or if the exhibition environment is highly controlled, no glazing may be used. The picture frame may contain a protective "glazing" of picture framing glass or acrylic sheet, e.g. It restrains materials in the frame and can be used to help set off or reveal the picture aesthetically. The lip extends a proportionate distance up from the edge of the rabbet. The rabbet functions as a shelf to hold the frame glazing (if any is to be used), some sort of spacer or mat/matte to keep the object safely behind the inner surface of the glazing, the object itself, and backing boards to protect the object from physical damage and environmental pollutants. Picture frame mouldings come in a wide variety of profiles, generally in some sort of L shape with an upward "lip" and a horizontal rabbet. Intricate decorations are often made of molded, then gilded plaster over a wood base. Some picture frames have elaborate moldings, which may refer to the subject matter. Both genuine gilding and imitation gold remain popular, although many other surfaces are to be found in most framing establishments. A frame surface may be of any color or texture. silver, bronze, aluminum, and stiff plastics such as polystyrene. Traditionally picture frames have been made of wood, and it remains very popular because wood frames can provide strength, be shaped in a broad range of profiles, and allow a variety of surface treatments. A picture frame is a container that borders the perimeter of a picture, and is used for the protection, display, and visual appreciation of objects and imagery such as photographs, canvas paintings, drawings and prints, posters, mirrors, shadow box memorabilia, and textiles.
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