Mocaa, Cape Town: grain silo reborn as Africa's answer to Tate Modern

Thomas Heatherwick pulls off an awesome act of architectural mutilation – just don’t mention the luxury hotel upstairsTwinkling like rows of cut-glass decanters in a well-stocked drinks cabinet, the faceted windows atop Cape Town’s new contemporary art museum rise as a crystal beacon above a motley jumble of wharves, warehouses and shopping malls.The windows shine out from the crown of a majestic concrete grain silo that has stood here since the 1920s, once the tallest building