balloon blue cables color colour concentric diversity England english fabric gray Great Britain green grey guyropes hawsers hot air balloon inflated inflation inside interior orange panels pattern red rings ropes strings yellow above aerial-balloon angled angles apartment-blocks architecture backgrounds 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