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Janet, it seems to me this may have ANOTHER connection: There have been reccommendations of putting rows of tape on a floor for a PWP to look at while walking to prevent freezing, and it is said to work, also a PWP can walk up or down stairs (think of the regular pattern of horizontal lines seen while walking..) easier than walking on a flat floor. NOW I have a totally unrelated question that is bothering me, for the scientifically gifted to answer: A person sits in the driver's seat of a car, in the U.S., on the left side and looks through the rear view mirror at the car behind, and sees the driver, on the left side...makes sense, so far, but then looks at the nameplate of the car behind and the text is backwards, a mirror image, RIGHT? So why is the image of the driver of that car NOT backwards? Worse yet, the image of the nameplate is reversed, as expected, horizontally, WHY is is NOT reversed vertically? I am sure I am missing something obvious, but WHAT? Everytime I think I know all the answers, a new set of questions comes along! Ken B