The
wall around the Imperial Vault of Heaven is the well-known Echo Wall
(Huiyinbi). It is3.27 meters high 90 centimeters thick, and 193.2 meters
long and has three doors to the south.
Interesting:
What is interesting for the wall lies in the fact that if one person
speaks or even whispers at one side of it, another would be able to
hear rather clearly on the opposite side.
Reason:
This is because of the conductibility of sound waves; the wall itself
has eaves and is hermetically
laid. These factors are supposed to let human voice "travel"
round the wall easily.
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The
wall around the Imperial Vault of Heaven is the well-known Echo Wall
(Huiyinbi). It is3.27 meters high 90 centimeters thick, and 193.2 meters
long and has three doors to the south.