Humans can navigate in darkness quite well if trained. For vision, you look for shadows. Shadows are generally things that absorb light and reflect it, like tr

Humans can navigate in darkness quite well if trained. For vision, you look for shadows. Shadows are generally things that absorb light and reflect it, like trees. Hearing can also tell you how close things are. In still air, a tree absorbs sound. Moving air flows around objects. Then there is the feel of terrain underfoot. :)