bicycle follow footstep ground mark path print route sand step trace track trail wheel abstract autumn autumnal background brown covered fall leaf leaves maple pattern red texture woodland baum brick bricks pavement pedestrian stones street tile walk wall wallpaper walls alone color colours fallen fallen leaves isolated solitary sveres turning ammo ammunition army blood bullet danger shell-case shoe shooting shot war wound wounded aircraft battle defence destroy explosive ground-to-air missile military missile rocket security surface to air missile weapon blur Copenhagen Denmark metro motion Nyberg rail subway tracks train transport tube under ground urban