Open courtyards, also known as atriums or atria, are outdoor spaces surrounded by walls or buildings. They are typically open to the sky and often feature a central pool or fountain. Atriums are common in ancient Roman architecture, but they can be found in many other cultures as well. They are often used as a gathering place for socializing or for religious ceremonies. Open courtyards provide a pleasant and inviting atmosphere, and can be a great way to bring the outdoors into an indoor space.