The eyebrows do double duty in mian xiang in a way most of the face's other features do not. Read as the Siblings Palace, xiongdi gong, they cover relationships with brothers, sisters and close peers, judged for length, shape and even arching, long well shaped brows read as harmonious sibling ties and a wide circle of loyal friends. Read at the same time as the Guardian Officer, the first of the system's five officers, the identical feature is judged instead for longevity and general temperament. The twelve palaces and the five officers are not two separate face maps a practitioner chooses between, they are two overlapping readings applied to the whole face at once, and the eyebrows are one of the clearest places that overlap becomes visible, since one physical feature is asked to answer two differently framed questions using the same visual evidence.
That doubling is not treated as a contradiction within the system. A reader trained in mian xiang expects the two readings to reinforce each other more often than not, since long, well groomed eyebrows plausibly support both a reading of harmonious peer relationships and a reading of even temperament and longevity, but the tradition keeps the two vocabularies, palace and officer, formally distinct rather than merging them into one combined eyebrow reading.