Jalousie window Jalousie window A jalousie window (, ) or louvre window (Australia, New Zealand, Pacific Islands, Southeast Asia, United Kingdom) is a window composed of parallel glass, acrylic, or wooden louvres set in a frame. The louvres are joined onto a track so that they may be tilted open and shut in unison to control airflow, usually by turning a crank. Jalousie is the French word for jealousy. It originated in 18th century France from the Italian word "geloso", which means jealous, or screen, as in to screen something from view. Supposedly because of their slatted louvres, jalousie windows protect the
Palladian architecture often model his villa elevations on Roman temple facades. The temple influence, often in a cruciform design, later became a trademark of his work. Palladian villas are usually built with three floors: a rusticated basement or ground floor, containing the service and minor rooms. Above this, the piano nobile accessed through a portico reached by a flight of external steps, containing the principal reception and bedrooms, and above it is a low mezzanine floor with secondary bedrooms and accommodation. The proportions of each room within the villa were calculated on simple mathematical ratios like 3:4 and 4:5, and the different