The note, when broadly encompassing "Citrus Fruits," presents a vibrant, multifaceted olfactory experience, typically manifesting as an immediate, exhilarating burst. Its initial impact is often sharp, intensely zesty, and effervescent, akin to a splash of liquid sunlight. It possesses a sparkling, airy quality with a high degree of projection, quickly filling the space with its bright energy. Depending on the specific fruit, it can range from the tart, bracing acidity of lemon and lime, to the juicy, sweet-sour tang of orange and mandarin, the elegant, slightly bitter sophistication of bergamot, or the more complex, almost floral-green nuances of yuzu and grapefruit. Texturally, it feels crisp and clean, sometimes almost aldehydic, adding a 'lift' to compositions. As a quintessential top note, its longevity is generally ephemeral, an exquisite flash that quickly dissipates, leaving behind a softer, often sweeter or greener echo as it blends into the heart. Its evolution sees the initial vibrant sharpness mellowing, revealing more subtle fruity, floral, or even woody undertones depending on its supporting cast.