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| Instances | Atmosphere | Atmosphere is a Mixture of gases surrounding any celestial object that has a gravitational field strong enough to prevent the gases from escaping. |
| | Entity | The universal class of individuals. This is the root node of the ontology. |
| | Object | Corresponds roughly to the class of ordinary objects. Examples include normal physical objects, geographical regions, and locations of Processes, the complement of Objects in the Physical class. In a 4D ontology, an Object is something whose spatiotemporal extent is thought of as dividing into spatial parts roughly parallel to the time-axis. |
| | Physical | An entity that has a location in space-time. Note that locations are themselves understood to have a location in space-time. |
| | Region | A topographic location. Regions encompass surfaces of Objects, imaginary places, and GeographicAreas. Note that a Region is the only kind of Object which can be located at itself. Note too that Region is not a subclass of SelfConnectedObject, because some Regions, e.g. archipelagos, have parts which are not connected with one another. |
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