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Ken Powell, who reviews the Mario Botta exhibition on page 45, is an architectural critic, author and historian. He has recently written a book about 30 St Mary Axe

Steven Spier, who reviews the Nobel Peace Centre on pages 25-34, is head of the Department of Architecture at the University of Strathclyde in Glasgow

Thomas Heatherwick, whose sketchbook features on page 58, is a designer whose work ranges from products to buildings, urban design and public art

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