This should be put together, and the chairs in class should take turns to sit. This is a proverb, which roughly means: the chairs in class take turns to sit, and the daughter-in-law once sat on her grandmother. There are other versions, such as the chairs in class take turns to sit, and the daughter-in-law will be a mother-in-law one day/a daughter-in-law for ten years, and so on.
On the ground, the wind and water turn. "Feng Shui takes turns" comes from the theory of "Feng Shui three yuan nine luck". The whole sentence should be symmetrical with the front, and "on the ground" makes the sentence look symmetrical and neat.