Which glass is filled correctly?

filled almost to the top? Should you pour only a small amount? Is there a special rule that professional sommeliers follow?

And then comes the question that has puzzled many people:

Which glass is filled correctly?

Imagine four glasses sitting on the table, numbered 1, 2, 3, and 4. Each contains a different amount of crimson-red wine.

One glass is filled nearly to the rim.

Another contains about half a glass.

A third has only a small serving at the bottom.

The fourth sits somewhere between the others.

At first