Wallace Stevens’ “Thirteen Ways of Looking at a Blackbird” uses hue-based three-line units like “Icicles filled the long window / With barbaric glass. / The shadow of the blackbird crossed it”; Sylvia Plath’s “Tulips” contains stanzas centered on red (“The tulips are too excitable, it is winter here… / Their redness talks to my wound”) forming hue-based triads; Gwendolyn Brooks’ “kitchenette building” uses gray imagery across three lines to convey urban drabness; Tracy K. Smith’s “The United States Welcomes You” employs green and red in three-line segments to signal danger and desire; Contemporary poet Aimee Nezhukumatathil uses coral, turquoise, and saffron in three-line nature stanzas; Terrance Hayes’ “Wind” uses blue-black hues in triadic stanzas to evoke mood and memory.