The Pythagorean Fair Cup in CeramicThe "fair mug", which dates back to the 6th century BC, is a masterpiece of the ancient Greeks' hydraulic technology, but also a method of teaching. Apart from restricting wine consumption through a "smart glass", Pythagoras wanted to teach his students the temperance, and the respect for the measure. How it works: Inside there is a line drawn, which limits the quantity of wine. If the user does not cross the line, then they can enjoy their "drink".