People in cafes and bars have to devote more time to live communication with each other and not to their phones.
Going to any cafe in everyday life or even on the weekend you’ll notice that most of the people around are immersed in their mobile phones, and even you are upgrading your page in social networks more often than you drink beer. That is why a special glass was invented in Brazil. This glass can not stand on the table until you put under it your mobile phone.
This design was created to make people in cafes and bars spend more time in live communication with each other, rather than checking new messages or correspondence via smartphones.