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First, and probably most important, almost
all shuttle spacewalks are conducted within the three wall confines of the
shuttle's payload bay. The concave surface surrounding the spacewalker
is probably sufficient to maintain the illusion of being contained, of
being surrounded by a stable frame of visual reference. Second, whenever
the spacewalker moves out of this envelope of containment, he or she
is usually firmly attached by footholds to either the end of the
robotic arm or to the edge of the payload bay.
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