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Architects are not renowned for considering how their buildings might affect
the environment. Tall buildings often block out light, or create glaring
reflections that make work impossible in nearby offices. And they also create
wind tunnels between them. But researchers at the Massachusetts Institute of
Technology have developed an urban planning system called Urp. It has a
projector which creates a digital image of light, shade and wind patterns, then
projects the picture down onto scale models of buildings. A camera on the
projector uses markers on the model buildings to update the image when you move
the buildings around.