|This article is about an older version of DF.
A window is an item of furniture that can be constructed to form solid walls surrounding a room. A window is not considered support for the purposes of preventing cave-ins, but it will block the flow of water and magma. Glass windows can be made with any type of glass at a glass furnace, and are placed similarly to furniture. Like all furniture, windows must have a floor underneath them to be built. Alternatively, a gem window can be directly constructed from three cut gems of any type (including cut glass). If the gems used to make a gem window are of different colors, the window will flash between the different colors of the gems.
Dwarves will get a happy thought from windows built of a material they like. Light from a window built into the cliff face will not illuminate a room or trigger cave adaptation. However, dwarves can see through windows, and will run away from hostile creatures standing on the other side of the window.
Gem windows, on the other hand, do not receive value multipliers; a gem window's value is the sum of the value of the gems used in its construction. For maximizing value, gems are better used for decorations, even if your gem cutter and gem setter are only dabbling.
Due to a bug, dwarves frequently get stuck when placing windows, sometimes making it necessary to deconstruct and reconstruct the window in order to free them - see well for more information.