arrow black black-on-white communicating communication direction directional gray grey indication law no-alternative one-way one-way-signs only pointer pointing reflective sign signs specific street-sign traffic traffic-flow traffic-sign white beak bird close-up duck eye feather fly whistling White-faced wing feathers formation grass reflections sky splash water whisteling white faced architecture atmospheric berlin building buildings charlottenburg classic decoration decorative estate facade gable germany Historic house home house houses idyllic mansion property real estate representation representative roof roofs rural villa white house window windows