A bay window is a window space projecting outward from the main walls of a building and forming a bay in a room. A bow window is a form of bay with a curve rather than angular facets; an oriel window is a bay window that does not touch the ground.
A window may be all three: projecting outward from the main fascia of a wall, curved in shape, and not reaching the ground. A bay window may be supported from the ground by a foundation, or in space by corbels, brackets, or cantilever.
A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air. Modern windows are usually glazed or covered in some other transparent or translucent material, a sash set in a frame in the opening; the sash and frame are also referred to as a window. Many glazed windows may be opened, to allow ventilation, or closed to exclude inclement weather. Windows may have a latch or similar mechanism to lock the window shut or to hold it open by various amounts.
Types include the eyebrow window, fixed windows, hexagonal windows, single-hung, and double-hung sash windows, horizontal sliding sash windows, casement windows, awning windows, hopper windows, tilt, and slide windows (often door-sized), tilt and turn windows, transom windows, sidelight windows, jalousie or louvered windows, clerestory windows, lancet windows, skylights, roof windows, roof lanterns, bay windows, oriel windows, thermal, or Diocletian, windows, picture windows, rose windows, emergency exit windows, stained glass windows, French windows, panel windows, double/triple-paned windows, and witch windows.
A dais or daïs (/ˈdeɪ.əs/ or /ˈdeɪs/, US also /ˈdaɪ.əs/ but sometimes considered nonstandard) is a raised platform at the front of a room or hall, usually for one or more speakers or honored guests.
Historically, the dais was a part of the floor at the end of a medieval hall, raised a step above the rest of the room. On this, the master of the household or assembly (e.g. the lord of the manor) dined with his senior associates and friends at the high table, while the other guests occupied the lower area of the room. In medieval halls, there was generally a deeply recessed bay window at one or both ends of the dais, which provided retirement or greater privacy than the open hall. The dais area often had its own doorway for admission from the master's chambers, whereas most of the guests entered through a doorway leading into the main area of the hall.
An oriel window is a form of bay window which protrudes from the main wall of a building but does not reach to the ground. Supported by corbels, brackets, or similar cantilevers, an oriel window generally projects from an upper floor, but is also sometimes used on the ground floor.
The Chicago Building or Chicago Savings Bank Building is an early skyscraper, built in 1904–1905. It is located at 7 West Madison Street in Chicago. Designed by the architecture firm Holabird & Roche, it is an early and highly visible example of the Chicago school of architecture.
The building's features characterize this style through the use of large "Chicago windows", metal frame construction, distinctive bays, and terra cotta cladding. The combination of the north side projecting bay windows, and the east side rectangular "Chicago windows" with movable sashes is representative of the two typical Chicago school window types. The building is prominently located on the southwest corner of State Street and Madison Street, with visibility increased by an offset in the alignment of State Street.