How does the symbolism Killen and Chopin use in “Blue + Yellow” and “The Story of an Hour” respectively aid and/or suggest the overall plot of each story?

Symbolism is a device authors use to help tell a story. It can often help suggest over all themes, sub-textual meanings, and even the plot.How does the symbolism Killen and Chopin use in “Blue + Yellow” and “The Story of an Hour” respectively aid and/or suggest the overall plot of each story?