car cars city door light metro moving on the move people run stockholm stress subway train travel Underground waiting walki walking work commuting movement Nyberg passenger scene scenery speed transport tube tunnel urban communication crowd going home Mexico passengers public transportatio railroad black ceiling colorless colourless commute concrete dark DC Federal Triangle gray grey grim repetition station structure tiles transportation Washington Cerro de la Silla landmark metropolitan Monterrey mountain Parque Fundidora skyline grunge paint texture traffic yellow burning flower hot life lilly lush orange