“Jimmy sent me this picture.” He took out his wallet with trembling fingers. “Look there.”
The small detail of “cracked in the corners and dirty with many hands” captures how proud Mr. Gatz is of his son: he has been showing off the picture to his fellow “dreamers,” the unsophisticated, “illusioned” ones who naively think that social status can be altered with wealth.
The fact that his son acquired a mansion has long been his source of pride, yet the presence of the actual house stuns him, as demonstrated by his “trembling fingers.” His excitement mingles with disbelief, because he still does not fit into the pompous lifestyle of the rich; yet here he is, in Gatsby’s personal palace. Of course, Nick takes a more arch perspective.
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