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Kerry Walshe, a year-six student at Manchester School of Architecture, designed 'The Phototropic Interseasonal City' for a site in Salford as part of an effort to give the borough a sense of identity. Shown is one of a series of high-rise buildings intended to provide a 50 per cent reduction in energy consumption compared with the norm. Shown here is the tallest, 30-storey, tower, divided into three zones: retail at the base; offices above; and residential pods at the top. Free solar energy comes from roof-top photovoltaics and solar thermal collectors.

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