Hold the bad jokes. During a wine tasting, the wines to be judged can be arranged in two ways: horizontally or vertically. A horizontal tasting features the same vintage—say, a series of eight 1994 Sonoma Valley Chardonnays—vinified by different producers. A vertical tasting is just the opposite—several vintages of the same wine, such as a fourth-growth Châ̂téau Prieuré́-Lichine Margaux chosen from 1982 to 1995.