Open floor plan designs are good for many reasons. In offices, they facilitate communication and collaboration, and in homes and apartments they keep things bright and flowing. The only time they are not good option
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http://www.manufacturedhomepartsinfo.com/roomdividersandprivacyscreens.php has some info on how to accessorize your home with room dividers and privacy screens.
Utilizing louvered shutters indoors are an airy, inexpensive way to create a versatile seperation of spaces...
tear out a section of wall between din/liv or kit/fam and build shelves into the studs, paint. Makes it more open, and useful at the same time!