A spatial thing type by dimensionality and a specialization of spatial thing. Each instance of spatial thing with one or more dimensions is a spatial thing having a positive (i.e. non-zero) number of dimensions, and thus is either a one- or two- or three- (or higher-) dimensional spatial object.

Examples of PositiveDimensionalThings include tangible or intangible spatially-localized objects, such as the edge of a tabletop, the surface of the tabletop, and the table itself, as well as abstract geometrical objects that are at least one-dimensional, such as a Platonic circle or cube. Excluded from this collection are geometrical Points and any other ZeroDimensionalThings.

Specializations of spatial thing with one or more dimensions include extended region of space, shaped thing, and thing with two or more dimensions.