Beams are either straight or slightly arched; the latter is called yueh-liang, or "crescent-moon beam".
In the Sung dynasty, the height of the columns will increase toward the corners of the building.
All beams are straight; the "crescent-moon beam" has no place in official Ch'ing architecture.
The columns, though slightly tapered, are straight with no entasis. The slight in ward incline, however, is still the rule.