angles appearances architectural architecture box-like buildings business district CBD city city scapes city views colors colours concrete contemporary contrast contrasting distance distant elements exterior external glass heights high high rise Hong Kong light linear lines modern office buildings perspectives reflections skyscrapers sleek slim style views walls wealth windows blue business-district city-scapes city-views color colour distinctive gray grey high-rise office-buildings offices rectangles rectangular reflective appearance arched arched-windows black block boxes building colored colorful coloured colourful dark decoration decorative design height heritage historic historical history masonry old ornamental ornamentation plain reflection Rooms solid Somber sombre stonework surfaces circular photographer round rounded Singapore skies sky