12 ACOUSTICAL AND LIGHT TRANSMITTING SUSPENDED CEILING SYSTEMS, COMPRISING GRID SYSTEMS AND DECORATIVE COMPOSITION LIGHTING AND CEILING PANELS AND THE ESSENTIAL HARDWARE THEREFOR, SOLD AS A UNIT; AND PLASTIC ARCHITECTURAL AND DECORATOR PANELS IN VARIOUS PATTERNS AND COLORS FOR USE AS SHUTTERS, ROOM DIVIDERS, DOOR TRIM, SHOWER DOORS, WALL COVERING, AND THE LIKE WHICH ARE NORMALLY SOLD THROUGH BUILDING PRODUCT CHANNELS OF DISTRIBUTION