What is a series of floor openings that connect two or more stories and are not used for elevators or garbage chutes called?

An atrium is defined as a large open space within a building, typically a multi-story structure, that features a series of floor openings connecting two or more stories. These openings allow for light and air to circulate throughout the space, promoting an inviting atmosphere. Unlike elevators or garbage chutes, which serve specific functional purposes, the atrium's design focuses on aesthetics and communal space.

In terms of functionality, the atrium often serves as a central gathering area that can enhance the architectural beauty of a building. It has the ability to bring natural light deep into the structure, and it often incorporates various environmental considerations into its design, contributing to overall energy efficiency.

The other options represent distinct architectural features that do not align with the definition of the floor openings connecting multiple stories. A courtyard, for instance, refers to an open area surrounded by walls or buildings and does not involve vertical connections between floors. A gallery typically serves as a corridor or passageway, often displaying art or other items, and is not inherently connected to the multi-story aspect. A mezzanine is usually a partial floor, situated between two main floors, that may be open to the space above or below, but it does not represent a series of openings for light and movement between multiple levels in