The note bursts forth with an immediate, electrifying flash, intensely bright and almost searingly fresh. It presents as a multifaceted citrus experience, primarily evoking the distinct profile of grapefruit, yet with an accentuated 'zest' that suggests the very essence of its outer rind. One perceives a sharp, invigorating tartness, devoid of excessive sweetness, that quickly morphs into a nuanced bitterness \"pithy\" and elegant, not harsh. It carries an effervescent quality, almost sparkling, like tiny bubbles of citrus oil suspended in the air. The texture is perceived as crisp and clean, with a transparent, airy quality rather than a heavy, oily one. It projects with remarkable initial strength, commanding attention, but, typical of its volatile nature, it begins to soften and recede fairly quickly, leaving a clean, almost mineralic afterglow. Primarily a top note, its role is to create an immediate, invigorating opening that lifts and brightens the entire composition.