While most literary uses of “Xanadu” immediately call to mind Coleridge’s famed palace in Kubla Khan, a few authors have extended the name into the realm of color—evoking a distinctive, muted greenish-gray hue that carries both mystery and wistfulness. In these passages the term shifts from a proper noun for a mythic locale into a chromatic metaphor, infusing scenes with an otherworldly, almost nostalgic quality. For instance, as in one description where “the Xanadu had come beneath a tremendous waterfall” ([1]), the word seems to denote not merely a place but also a tonal quality that enriches the scene with an exotic, soft luminescence. Similarly, in passages where the landscape or even an object is imbued with this ambiguous color, readers are invited to envision a world at once opulent, decaying, and evocatively elusive—an effect that deepens the textual interplay between memory, myth, and mood.