What is the significance of the pool in the Great Gatsby

The pool symbolized Gatsby's fantasies and the summer of opportunities, as well as his desire for Daisy. The pool was also used by many party-goers and other people, while Gatsby did not. That symbolizes that he had not moved on, and his desire to swim on the pool at the end portrays his want for summer to stay, and his lamentation that he had not won Daisy.