What is the Symbols & motifs of chapter 7?

Light or lack of light symbolizes that Gatsby's relationship with Daisy means he no longer needs to have his parties anymore:

"It was when curiosity about Gatsby was at its highest that the lights in his house failed to go on one Saturday night." (113)

Gatsby's car has leather green seats: the same color f longing that he pines for when he looks across the bay.