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The height of columns (zhu  )
may not exceed 375 fen, nor may it exceed the width of the central
bay. Columns are subject to two rules which contribute to the curvature
of the structural frame. It is easier to construct a model without applying
these rules, but you will reduce the curve of the roof.
- Columns are unequally tall: they are taller at the corners of the building
and shorter in the middle. This variation in the column height is called
shengqi.
- Columns are not truly vertical: they are tilted inwards towards a point
or points above the centre of the building. This manipulation of the columns
is called cejiao.
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