above aerial-balloon angled angles apartment-blocks architecture backgrounds balloon below buildings cityscape colors colours condominiums flats flight-operation gondola height helium helium-balloon high high-rise modern motion movement multi-storey multi-story perspectives roofing roofs rooftops rooves safe safety scene scenery scenic secure secured shape shapes sights sightseeing Singapore skyline streets traffic views abstract architectural business-district city city-scapes city-views color colored colour coloured commercial-building contemporary contrast contrasting distance distant elements exterior external glass heights light linear lines metropolis metropolitan-area office-buildings rectangles rectangular reflections skyscrapers tower-block urban-area walls wealth windows appearances arched arches box-like colorful colourful concrete dark decorated Designs detailed distinctive façade flowers gardens greenery grime heritage historic levels low patterns quality Sizes structures style styles supports tall tower towering variety