A window blind or shutter designed to direct light downward while blocking direct sunlight from entering a room.
French word combining 'abat' (to beat down) and 'jour' (day/light), literally meaning 'to beat down the light.' The term describes architectural elements that manage natural illumination.
Before electric lights, controlling sunlight was an architectural challenge, and these clever devices let in diffused light while protecting precious items and people from harsh rays—the original smart glass technology.
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