Behind the main hall, there is a 花台 (huatai, "flower bed") of raised earth in a half-moon shape. It is also called the 化胎 (huatai, a homophone which means something like "conception") and functions as the "backrest" of the house.
正廳後方以土填高的半月形花台名為「化胎」，有如房子的靠背，在風水上其有安穩的象徵，同時也代表「有後」，祈福後代萬世昌隆。