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Remember those parking antenae that would scrape along the
curb and warn you when you were too close to the curb? How
about a similar thing for mobility canes to help people with
visual disabilities navigate? The cane could have a spray of
really thin but resillient and rough tendrils coming
end that would warn the user of impending danger. Maybe
you could retract them for greater accuracy in tight spots.
||This is what the sweeping of the cane used by visually impaired people does. Having 'whiskers' on the end of the cane may mean that there are too many false triggers or the direction of the triggering object may be harder to determine.