vapor rising from the marsh’s open surface stimulates and fertilizes; stimulating words cheer and inspire. Open begins the yin hemicycle by initiating the formative process.
This passage establishes the marsh (via the trigram Open/Tui) as a symbol of primordial generative energy, specifically the initiating force of the yin hemicycle whose vaporous rising enacts fertilization and psychic stimulation.
, I Ching: The Classic Chinese Oracle of Change, 1994thesis