Abstract
The skills required to walk with ease and confidence in a variety of environments are quite complex and involve detailed sensory information. The aim of sensory aids for blind persons that indicate the presence or absence of obstructions in the travel path is compared with the aim of possible devices that would provide more detailed information about various aspects of the environment. The “reading” of the environment to provide cues for orientation is compared, by way of analogy, with the formation of sentences from words through the use of the rules of syntax and grammar.
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