It happens naturally outdoors. Vining plants creep and climb and cover walls and other vertical surfaces.   Indoors the same affect takes a little planning and work, but the results can be spectacular.  The living wall pictured here is the creation of Plantscapers (www.plantscapers.com), an Irvine, California company specializing in interior plant design since 1981. This is their new Interior Green Wall System.  It looks great and keeps the indoor air really clean.