Spatial Things have a spatial extent or location relative to some other Spatial Thing or in some embedding space. Note that to say that an entity is a member of this collection is to remain agnostic about two issues. First, a Spatial Thing may be partially tangible (e.g. Texas-State) or wholly intangible (e.g. the Arctic Circle or a line mentioned in a geometric theorem). Second, although we do insist on location relative to another spatial thing or in some embedding space, a Spatial Thing might or might not be located in the actual physical universe. It is far from clear that all Spatial Things are so located: an ideal platonic circle or a trajectory through the phase space of some physical system (e.g.) might not be.