Already the halls and salons and verandas are gaudy with primary colors, and hair shorn in strange new ways, and shawls beyond the dreams of Castile
This passage shows the contrast between the showy wealth of “west egg” to the poverty of the “valley of ashes” because this passage makes it obvious that the people at this party do not try to hide their wealth where as the in the valley of ashes there seemed to be an unspoken secrecy about the lack of wealth there. the word “gaudy” suggests things that are flashy, loud, and wanting to be seen, showing that these people want others to see how much money they have and they are not embarrassed, rather they are proud. and the fact that the “halls and salons and verandas” are colorful shows that this party stands out, and is meant to highlight the wealth of it, and the person throwing the part (Gatsby). this is a contrast to the ashy hues of the valley of ashes (a less wealthy area) where people and blend in rather than stand out, suggesting that people do not want to face the poverty of the people there nor do the inhabitants want to highlight it.
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