Threshold, Gateway to the Dream City
From UnderlightWiki
Upon entering the city a dreamer finds himself/herself in the Courtyard of Awakening where s/he can decide which open threshold to enter. Currently, the Emergence Academy, the Scryers of Truth, and the Council of Wardens are the only open houses. There are eight thresholds (corresponding with the eight houses) organized in a circle and connected by halls. Within each house threshold there is a portal to the corresponding house plane, direct access to within the house itself (only accessible by members of that house), and a hall on each side. Every other hallway will afford you access either to the Library or Threshold Pits. Only the threshold of an open house is a sanctuary.