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 apartment city dwelling home housing London tower towerblock afternoon avenue blue sky boulevard bush bushes cloud condominium crossing path flat green outdoor plant plants residential area road sky