Suzhou garden is a private garden and a part of the house. The habit of local residence is that the gate does not face south, because it is considered that the south is a fire and cannot be tolerated without the blessing of the emperor. The south side is east, which is conducive to identity, so the entrance of the courtyard itself is biased and it is difficult to be symmetrical.
Although the whole courtyard is asymmetrical, the reception part of the house is basically symmetrical, such as the sedan chair and living room of Master Wang Garden and Humble Administrator's Garden.
Suzhou gardens pursue imitating nature better than imitating nature, so there is no symmetry in nature.