AWARD-WINNING architect Sir Norman Foster, whose work - including the design of the Hongkong Bank building in Central - has added imagination and style to skylines around the world, arrived in the territory last night to mark the opening of his company's Asian headquarters. Sir Norman will also preside over an exhibition of his most acclaimed projects, with special emphasis placed on its design of the airport terminal at Chek Lap Kok. Models of the new terminal will be displayed, allowing the public to see its distinctive roof - symbolising flight - and its spacious atrium. While Sir Norman's early work added to the 20th century notion of an urban environment being full of concrete, his recent buildings and plans for the future inspire more of an image of a ''glass menagerie'' with concrete replaced by glass and steel. Paramount among Sir Norman's future projects is the proposed Millennium Tower, planned for completion in Tokyo by the year 2000. In an innovative proposal to create a town within a tower, the 800-metre high structure will accommodate 50,000 residents who will be shuttled to in-house jobs, shops and leisure activities by high-speed lifts. As well as opening the ''Foster since the Bank'' exhibition - to be held in the 46th floor sky-lobby of Wan Chai's Central Plaza - Sir Norman will also give a public lecture at the Hong Kong University on Saturday.