It has been presumed that children who reverse letters or words see them backwards, this is false. They have directional confusion. In the real world direction has no meaning, for example, a chair is a chair no matter which way it is placed. Changing direction does not change interpretation. In the world of language direction changes meaning. Connect the bottom of a chair and it looks like a "b", Turn it 180 degrees it becomes a "d", flip it upside down and it becomes a "q", and flip it again it becomes a "p". Thus, direction changes meaning. The difference between "was" and "saw" is direction.
