The hexagram has the form of a flying bird. ‘The flying bird brings the message: It is not well to strive upward, it is well to remain below. Great good fortune.’
Wilhelm establishes the flying bird as both the structural image and the oracular voice of Hexagram 62, encoding the ethical principle that upward striving is rebellion while downward devotion yields great fortune.
, The I Ching or Book of Changes, 1950thesis