Windows with movable sashes The sliding sash window is the most common Victorian window design. Because of its 19th-century atmosphere and ageless appearance, this design is quite distinct. Due to its popularity, additional features such as run-through sash horns and mechanical joints have been included. These additions make the window more functional but not essential for interior ventilation. Original sash weights were made from silver or gold and had an ornamental design. They were attached to the bottom of the sash with a cord that passed through a hole in the baseboard track on which they hung. The double-hung window has two horizontal sashes that can be opened or closed by means of vertical wooden slats (or "shutters"). This window type was developed around 1835 and is widely used today in rural and suburban settings where energy efficiency is important but price is not. A person can open a double-hung window from the outside by lifting one sash at a time. This allows air to flow into the room while keeping noise out. The sashes are held in place by metal fittings called hinges. There are several varieties of these windows including casement, hopper, and slide-up/down. Curtains are used to create privacy inside your home while allowing light to enter. They may be used to block out the sun or heat during the summer and keep warmth in during cold weather.