Shapes of Greek vases
Ancient Greeks made pots to be used and they had many different shapes for different purposes. The basic form of each pot provides a clue to its function. For example, the open form of a shallow kylix or a deep kantharos or krater allows you to see and reach what's inside.
Some serving containers, like the krater, were too heavy to be carried around so they sat on a table at the middle of the party. But if you wanted to move around then a closed form would stop things from spilling out. The amphora has two big handles to help you carry it. The oinochoe is made for pouring liquid: this is why it has a fancy lip.
Sometimes they kept precious things on display in a pot with an open form or hidden in a pot with a closed form. They put jewellery and makeup in a pyxis, an opened shape that was closed with a lid. They put their most prized possession, oil, in a lekythos or a kothon. The lekythos, which has a closed form, has a narrow neck to stop the oil from pouring out too quickly. The rim of the kothon curves in to catch oil from spilling out.