playground arrow direction LA Louvière rotten rusty sign traffic trafic way bracket computer electric electromagnet electronic fan loop magnet technology ventilation wire army berlin detection electromagnetic equipment germany military peace radar ruin security teufelsberg war waves blue cold frozen hill ice crystals Morning mountain ski lift snow snowy sparkling sunlight winter background ceilinng circular color colour contrast light lighthing lights lit shadow shadows shapes subway surface surfaces texture Underground well-lit ceiling colored colorful coloring colors coloured colourful colouring colours creative curved curving decorated decoration decorations decorative design designed detailed display distinctive eixt-tunnel exit floor flooring lighting mirrored mirrors passengers pedestrians people shiny Singapore subterranean-tunnel thoroughfare transportation-route walled walls way-out Australia. railway tracks railways train transport concrete dilapidated frame metal ruined rural windows auto automobile car classic vintage wagon woodie