is so enormous, that admitting, what I believe has never been denied,
its length to be fifteen hundred miles, and the dimensions throughout
pretty much the same as where it was crossed by the British Embassy,
the materials of all the dwelling-houses of England and Scotland,
supposing them to amount to 1,800,000, and to average on the
whole 2,000 cubic feet of masonry or brick-work, are barely equiva-
lent to the bulk or solid contents of the Great Wall of China. Nor are
the projecting massy towers of stone and brick included in this cal-
culation. These alone, supposing them to continue throughout at
bow-shot distance, were calculated to contain as much masonry and
brickwork as all London. To give another idea of the mass of matter
in this stupendous fabric, it may be observed, that it is more than
sufficient to surround the circumference of the earth on two of its
great circles, with two walls, each six feet high and two feet thick!
2
While there is obviously no disputing the Wall’s immense size, it is
nevertheless telling that Barrow’s elaborate calculations were based
on an extrapolation from the finite section of the structure that he
happened to visit in person. The former mathematician was, in
other words, using an exhaustive measurement of the section at
hand in an attempt to quantify the dimensions of a structure that
seemed to stretch to the limits of the human imagination.
Even today, almost all discussions of the Wall include an obliga-
tory specification of its length, as if the act of assigning the structure
a number (any number, really) might somehow render it more com-
prehensible. The range of these figures, however, underscores just
how limited our knowledge of the Wall really is. China’s official
Xinhua News Service, for instance, has cited lengths ranging from a
modest 3,000 kilometers to more than 60,000 (with the second esti-
mate referring not simply to the Wall’s linear trajectory, but rather
to the sum of all of the [mutually overlapping] individual border
walls constructed throughout this region). While one might think
that the question of the Wall’s length could be put to rest by a com-
16
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A UNITY OF GAPS