Distance also changes with shadows and lesser light. Close your eyes and think how many steps you have to the light switch or your closest tree and check if you can reach it with this number of steps and if your heading is right. do this many times and in different places and textures. For example a forest will not guide you in a straight line and a desert dune can tell you by the angle of the sand many things.
Play with this and remember that you can feel light even if your eyes are closed or burning. You can sense what you are stepping or crawling on without looking at it and with a stick without touching it. The wind will tell you of an opening, the angle of the ground of the landscape and the sound what you are stepping it. Move slowly. In the forest a broken leg is very much like a death sentence. Pay attention and do this drill with your kids.