Finally, we carry the lulav westward, representing G‑d’s manifest presence (as explained above) which represents our ability to become partners with G‑d in creation,9 as it were, to the point of being able to dictate His behavior10 and even annul his decrees.11

via Why All the Shaking of the Lulav and Etrog Set? – Sukkot & Simchat Torah.