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Brise soleil, sometimes brise-soleil (French: [bʁiz sɔlɛj]; lit. '"sun breaker"'), is an architectural feature of a building that reduces heat gain within that building by deflecting sunlight. More recently, vertical Brise soleil have become popular. Both systems allow low-level sun to enter a building in the mornings, evenings and during winter but cut out direct light during summer.
Brise-soleil can comprise a variety of permanent sun-shading structures, ranging from the simple patterned concrete walls popularized by Le Corbusier in the Palace of Assembly to the elaborate wing-like mechanism devised by Santiago Calatrava for the Milwaukee Art Museum or the mechanical, pattern-creating devices of the Institut du Monde Arabe by Jean Nouvel.
In the typical form, a horizontal projection extends from the sunside facade of a building. This is most commonly used to prevent facades with a large amount of glass from overheating during the summer. Often louvers are incorporated into the shade to prevent the high-angle summer sun falling on the facade, but also to allow the low-angle winter sun to provide some passive solar heating.
Millennium Point, Birmingham, UK
City of Arts and Sciences, Valencia: brise soleil at the L'Hemisfèric
The movable Burke brise soleil on the Quadracci Pavilion of the Milwaukee Art Museum closes at sunset.
The Carpenter Center for the Visual Arts at night
Curutchet House by Le Corbusier, inside view
- Brise soleil at the Milwaukee Art Museum
-  (Brise Soleil Commercial Applications)
- British-Yemini Society Influence of climate on window design
-  (demonstration of Brise Soleil in commercial applications)
- AD Classics: AD Classics: Palace of the Assembly / Le Corbusier
- Technical possibilities (in German)
- Museum of everyday culture (in German)
-  (Further reading on Brise Soleil from a supplier)