The first and foremost feature of the canopy bed has always been privacy. These beds are intended to create a mini-room inside your master bedroom, which is why they often feature curtains you can draw to block prying eyes, dampen sound, retain heat and/or eliminate unwanted light. Canopies turn your bed into a tranquil retreat from the outside world, a useful property no matter what your sense of style entails. Four-poster canopy. This is the type of bed you generally see in historical movies, looking swank and dramatic canopy lights outdoor. The four-poster may have a square frame, or even a detailed ceiling, supported on four high-rising bedposts at each corner of your bed. This is the most common style of canopy for the purpose of drawing curtains and cordoning off your sleeping area.