angles appearances architectural architecture box-like buildings business-district city city-scapes city-views color colour contemporary contrast contrasting distance distant elements exterior external glass gray grey heights high high-rise Hong Kong light linear lines modern office-buildings perspectives rectangles rectangular skyscrapers style views walls wealth windows abstract art asterisk backdrop background beige birthday bright brown cartoon celebration cheerful circles concept creation design dots fill flower fun graphic green happy illustration image kids naive New orange original out of border oval pattern purple render retro round spots spring star summer texture unique vector yellow curve curved greyscale monochrome office buildings colored colors coloured colours reflections skies sky business district city scapes city views