Pull up and down, and are mounted on rollers. They may be mounted at either the top or bottom of the window, unwinding either downward or upward. Shades reduce light and give privacy in direct relationship to their thickness and translucency or opaqueness. They may be constructed of vinyl are fabric and may be reflective to reduce heat gain. A fabric used elsewhere in the room can be laminated into a plain shade to give unity and individually. Roller shades are expensive. Gather shades, while performing in the same manner as roller shades, have a very different mechanism for raising and lowering them.