Post-Impressionism is a term used to describe the reaction in the 1880s against Impressionism. It was led by Paul Cézanne, Paul Gauguin, Vincent van Gogh and Georges Seurat. The Post-Impressionists rejected Impressionism's concern with the spontaneous and naturalistic rendering of light and color.
Answer:
1) to emphasize how dangerously packed the streets are
2) to highlight the idea that Caesar suffers from illness
3) to suggest that Caesar will soon be put to death
