When pouring liquor, even professional bartenders unintentionally pour 20 to 30 percent more into short, squat glasses than into tall, thin ones, according to a new Cornell University study.
Jason Koski/University Photography
Cornell Professor Brian Wansinks study showed that people overpour into short, squat glasses by 20 to 30 percent, compared with tall, thin glasses, probably because of the vertical-horizontal optical illusion that people consistently perceive vertical lines as longer than horizontal ones of the same length. Copyright © Cornell University
"Yet, people who pour into short, wide glasses consistently believe that they pour less than those who pour into tall, narrow glasses," said Brian Wansink, the John S. Dyson Professor of Marketing, Applied Economics and of Nutritional Science at Cornell. "And education, practice, concentration and experience dont correct the overpouring."
The reason for the difference, Wansink speculates, is the classic vertical-horizontal optical illusion: People consistently perceive equally sized vertical lines as longer than horizontal ones.
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