As a visitor once asked, when he noticed me swirling the wine, “Are you just showing off?” Well, no, actually. Of the hundreds of compounds in a glass of wine, some are particularly fragrant. Before swirling, they’re contained in the liquid (bound in solution). When you swirl, they’re released as vapor and up comes the “nose”. Experiment: Smell the wine. Swirl vigorously for several seconds. Smell it again. You’ll become a believer! More on wine tasting.