what purpose do the first four paragraphs,in chapter 1 of the great batsby,serve

The first four paragraphs in the Great Gatsby serve to foreshadow what will happen as the novel progresses. Nick is introduced as out narrator, and we're led to believe he's just an observer...... a non biased, non judgmental observe. This of course isn't the truth....... it's simply an illusion.

We see Gatsby presented as both vulgar and irresitible...... Nick falls under his spell, as does everyone else, but from the beginning we understand that nothing is as it seems. We just don't know how big an illusion we're dealing with.