What a great invention! Two wine glasses are connected at the bottom by a tube so that the wine can circulate between the two glasses. After some thought, I think it has two practical functions: first, it can limit binge drinking by alcoholics (because when you pick up the glass in a hurry, the wine will automatically flow to the other glass still on the table). Second, using these glasses during a candlelit dinner for two can create infinite romance (a surefire tool for charming women)!