Symmetrical balance is a principle of design where there is a mirror-like balance of elements in a room.  This picture (Ivory Homes model in the 2011 Salt Lake City Parade of Homes) is a good  real life example.  Notice the mantel has the same floral arrangement on each side.  The hearth displays pottery on each side.  And the chairs, though not mirror images, are of similar size so they are still symmetrically balanced.  Symmetry is a bit formal.  You can use it to ground elements that aren’t usually considered formal.  It is possible (in my opinion) to overdo the symmetry.  EXACT symmetry is too stiff.  That is why I said this picture is a good real-life example.  Notice the end tables flanking the sofa are completely different.  It makes the room seem livable.  I want to share the things I learn in design school to show the science behind the art of interior design.  I am a firm believer in the power of knowledge.  With the basics under your belt, there’s no reason your house can’t be your dream home.