Here's an excerpt from Prof. Kev Nair's fluency book: :-) How will you move from one end of a room to another in the dark? You feel the ground; you feel the walls; you move your hands around or hold them in front of you in order to feel your way; you move step by step -- pausing here and there. You retrace your steps. You change your direction, you stumble and regain balance. The more familiar the room and the objects in it are to you, the less your difficulty.