Depth perception

This article from "Science of Us" explains the psychology that bars use to "trick" you into buying more wine.

A bar actually ran an experiment. They served wines in differently sized glasses on different nights. Although the amount poured was the same, the results on customers were not. At the end of the experiment, they discovered that they sold more wine when they used a larger glass. The larger glass made it seem as if the customer was drinking less, so they would be more likely to order another!

Copas de vino en el Museo Vivancos de Haro en La Rioja

by Lourdes Cardenal -Wikimedia Commons

I think they are likely right!

Here is a link to the full article:  The way restaurants trick you into drinking more wine