Introduction Click to copy section linkSection link copied! Structural color, generated by interference and diffraction of visible light by periodic nanostructures, is ubiquitous in nature, providing vivid, nonfading coloration (by contrast with chemical pigmentation), with multifaceted function. (1−3) In Hibiscus trionum, for instance, directional iridescence from floral striations enhances visual cues for pollinators, improving flower detectability, orientation, and species recognition.