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(block) is one of three types of component in the bracket set; the others
are the gong (arm) and the ang (lever arm). It acts as a
seat for other components, such as a gong or a fang.There are four types of dou:
- the lu dou ,
which is the lowermost dou in the bracket set and sits on a column
or a lan'e. It measures 32 fen x 32 fen x 20 fen
high and is the largest of the dou.
- the jiaohu dou, which sits at the ends of the transverse hua gong or an ang.
- the qixin dou, which sits at the centre of a gong.
- the san dou, which sits at the ends of a longitudinal gong, i.e., not a hua gong.
For drawings, see Liang 1983, 242.