Have you ever actually looked at the overall design of the modern glass? There's actually a lot of complex design evolution behind it. It's specifically engineered to give the correct usage model in our heads. It's tall and long, perfect for being easily used by a single hand. It widens at the top for easy pouring, either into or out of the glass. Glasses have also evolved into many different forms, including multi-layer ones for insulation, wine glasses (Almost a world of their own.), plastic cups, beer mugs, and thousands of others. Each is specially designed for a specific purpose; we can instantly recognize many different types of glasses and know exactly what goes into each. It is also interesting how glasses evolved into the tall and narrow shape they are today instead of flat and wide, like a bowl. Hundreds or thousands of years of revisions and improvements led to the complex design of the simple glass. The history of the simple object, such as a glass, is often more rich and vibrant than we imagine.