Wine Glass Art

A Boccalino is a mug used in Ticino, Switzerland, to drink local wine (Merlot or similar). It has a volume of 0.2 liters. The Boccalino is also a popular souvenir for tourists.
Decoration
In the 18th Century, glass makers would draw spiral patterns in the stem as they made the glass. If they used air bubbles it was called an airtwist; if they used threads, either white or colored, it would be called opaque twist.