In the Bible, things that are lower down, or under, physically, generally represent things that are lower or more external spiritually. In some cases, the lower things have been separated and put away to protect the good, but in others, it can mean that a less exalted idea or good desire is supporting a more exalted one.

(Референце: Arcana Coelestia 4564 [1-2], 8610, 9656)

9657. 'Up to one ring' means being thereby held firm. This is clear from the meaning of 'ring' as a joining together, dealt with in 9493, 9495, at this point being held firm by being joined together, since it says that the boards 'shall be paired up to one ring'.