Loci

Loci are homogeneous Entities which occupy a location, have geometry and orientation, are capable of colliding? with each other, have relationships of containment and affixment with one another, have componented construction, and have their own Mana. They also introduce event propagation, which is the system which causes events to move from one object to another based on their location and relationships.

Areas and Items are the principle derivatives of Loci.

— GedTheGreysHain - 14 Jun 2003