Lucien Kroll (13 March 1927 – 1 August 2022) was a Belgian architect. With his wife, Simone Kroll, he founded the Atelier d’Architecture Simone & Lucien Kroll. They are considered to be the founders—as early as 1960—of participatory architecture, a consultative and immersive approach to the design of the built environment. Kroll's idiosyncratic style, closely tied to the participatory design process, was the antithesis of the modernist movement. He completed more than 100 projects.
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