1 "Guan" describes Cao Cao's ambition to dominate the world and his unfulfilled ambition through the description of the scenery of the sea. "Ci" describes the homesickness of a wanderer who cannot go home before the New Year. "Qian" describes the scenery of the author's journey to the West and expresses his unfinished mood. "Heaven" is a poem about homesickness.
2. Observation, real writing, fictitious writing; the combination of movement and stillness describes the turbulence of the sea water and the state of vegetation. This last question is about duality. I don’t find any rhetoric in it.