Excerpt: Before I begin my discussion, I would like to explain what I mean by the term "mobility." We customarily talk about the two terms "orientation" and "mobility" as if they were separate and independent activities. If this dichotomy is taken seriously, mobility becomes the ability to move through space safely, without the requirement of knowing where you are, where you want to go, or how to get there. Being able to move through space with the assurance that your next step will not be your last step is undoubtedly comforting, but if this is all we have in mind when we consider mobility, then mobility is not a very interesting activity. We would do better to say that orientation is an essential component of meaningful mobility. I certainly do not mean to suggest that the ability to move safely through space is not an important component of mobility, but when we add orientation as an essential component, mobility becomes a useful ability. Accordingly, when I use the term "mobility," I mean to indicate an activity that is impossible without orientation.
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