Vertical Blindsof metal, wood, PVC, or fabric can be shaped easily to fit and unify and odd-size openings and can hold inserts of fabrics or wall papers that coordinate with other materials in the room. Their louvers control light from side to side, rather than from up or down, and emphasizes the height of the windows and walls. Most vertical blinds afford a view directly in front of but not at the ends of a long window area. Newer materials are perforated for transparent effects. Of importance of household maintenance is the fact that the vertical surfaces collect less dust than do horizontal blinds. Vertical blinds may hang loosely from the top like a drapery, slide in tracks, or be joined by a chain at the bottom (and for long runs, they may be motorized). They afford complete privacy when closed (the louvers overlap) and can be energy efficient. A disadvantage is that they rather easily damaged, especially by children.