The Twin Chambers is arranged into three parts an enclosure in front of the chamber and two separate chamber rooms.
Enclosures are spaces set apart for people, usually shaman at these stone structure sites, for ceremonial usage. Some enclosures were used with a spirit and some were used without a spirit. It is unclear if this enclosure had a spirit or not.
Each chamber has an opening extending from the exterior to interior. The opening is a spirit portal. A spirit portal can be an entry point or an exit point. The interior wall also has an opening. The middle (dividing) wall opening allowed the spirit to travel from one to the other room.
The ceremony that took place inside this chamber had a spirit come into the chamber from the outside. The people wanted only a specific spirit to enter the chamber. To insure no other spirit entered the chamber, the rectangular stone slab was placed at the entrance to the enclosure. Note: At some stone structure sites an ordinary oversized boulder was used in lieu of rectangular shaped stone slabs. Any oversized stone whether slab or boulder placed to stand out is potential blocking symbolism.