The theme of the poem "Landscape with the Fall of Icarus" by William Carlos Williams is exactly that, the Fall of Icarus. This theme was explored many times throughout many major works, however here it is explored as a background image, not noticed by hardworking people in the sun. Icarus falls and drowns, and nobody bats an eye.
Mary Cassatt's painting usually depicted domestic setting, Of a world Mary was restricted ( since she was more of a respectible woman.) She often combined certain influences of japanese art along with some of her own. I guess her meaning changed every few paintings. For example "The Childs Bath" its said it shows "the Dignity of motherhood"
Hope that helps (:
Segregation; the two different races are being segregated (separated) from each other. Hope this helps :)