"Not only was he the tallest, strongest, most virile, and best built man they had ever seen, but even though they were looking at him there was no room for him in their imagination."
This line develops "Esteban" and also the town perception of him, as something that has no room in their minds but also that "Esteban" is a canvas that can be filled with imagination, with fiction.
Hester means that the letter has been on her for too long and too many people have seen it for it to just be taken off. The damage the letter has caused her has already been done.
WOW! I love the Great Gatsby. Daisy seemed a bit oblivious during the dinner scene, maybe because she refuses to see her husband's faults. She won't stop talking, which is a sign that she's nervous and trying to stop thinking about who her husband might have been talking to.
The green light symbolizes hope, and the American dream, which is why Gatsby can't stop contemplating it.