A "coffee cup" typically refers to a small, cylindrical-shaped container used for serving coffee. Coffee cups come in various materials, sizes, and designs, catering to different coffee preferences and occasions.
The enamel over steel technique creates a piece that has the heat distribution of carbon steel and a non-reactive, low-stick surface. Such pots are much lighter than most other pots of similar size, are cheaper to make than stainless steel pots, and do not have the rust and reactivity issues of cast iron or carbon steel.
Most antique art glass was made in factories, particularly in the UK, the United States, and Bohemia, where items were made to a standard, or pattern. This would seem contrary to the idea that art glass is distinctive and shows individual skill.