A brise soleil is an architectural feature designed to reduce heat gain in buildings by blocking direct sunlight. Typically made of horizontal or vertical slats, it is often installed on the exterior of a structure, particularly on windows or facades. This design helps to improve energy efficiency and comfort by minimizing glare and maintaining cooler indoor temperatures. Commonly used in modern architecture, a brise soleil can be found in various styles and materials, including wood, metal, or concrete. It is especially popular in warm climates, where excessive sunlight can lead to increased cooling costs. Notable examples can be seen in the works of architects like Le Corbusier and Oscar Niemeyer.