Nicole Zhang
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most cases be built of earth, stone and surfaced with brick, they are used as a belvedere
from which to look into the distance. In fact, however, many well-known ancient Tai today
are not just a bare platform but has some palatial halls built on top. A typical example is
the Round City of the Beihai Park in Beijing. As a terrace five meters high, it has an area
of 4, 500 square meters on its top and a main hall with side corridors.
The Tai could be built to serve different practical purposes. For example, Jianguomen
in Beijing which dates back to the Ming and Qing dynasties is an observatory. It could also
be used for military purposes like the beacon towers along the Great Wall, to transmit urgent
information with smoke by day and fire by night in emergency. Also on the Great Wall, there
is a square Tai at intervals of every 300 to 400 meters from which the garrison troops kept watch.