Analyzing Setting in Urban Prose

In an excerpt from a contemporary novel, the author vividly describes an urban downtown area during late evening:

As the bustling crowds began to thin, the flickering neon lights reflected off the rain-slick pavement, creating a kaleidoscope of colors that danced beneath the streetlamps. The aroma of street food wafted through the air, mingling with the distant sounds of laughter and music from nearby bars and clubs, accentuating the vibrant nightlife that enveloped the city. Above all this, the skyline loomed large, its towering glass structures a stark contrast to the old brick buildings that whispered the city’s history.

Based on this excerpt, which aspect of the setting most significantly contributes to the overall atmosphere portrayed?