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"Wires
and strings are so flexible that one would not think they could
be of much use in structures. But man's ingenuity has found ways
and means of using materials strong in tension, by shaping them
as thin, flexible ropes and cables, to build some of the largest
structures in the world."
p.
75 Art of Construction
What can be
done with one rope?

What
can be done with two ropes and some boards?
What can happen
with four ropes?

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