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Ken Yeang is the world’s leading architect in ecological design and passive low energy design and his ‘bioclimatic’ towers have had an impact around the world, fusing high-tech and organic principles. The principle of the UK practice of Llweleyn Davis Yeang Ken approaches each building as an addition to the earth’s living, breathing eco-system. Adopting techniques used in urban planning to analyse sites horizontally, he proposes their almost literal vertical application on skyscraper design – from circulation analysis, to vertical green zones.