i've spent the last few days helping my mother bring my father home from the hospital where he had been for he past two months after his last heart attack. in addition to the physical problems caused by the heart attack and then two months of relative inactivity, he's coping with near blindness caused by his lifelong diabetes.
i've never truly comprehended exactly how much we depend upon the perceptions we know and use on a minute by minute basis. balance, direction, perspective, and distance are all concepts which don't mean much to him without the visual cues he's depended upon all of his life. the home he's lived in for almost 40 years is alien and confusing to him.