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.

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

7. THE DIVINE OF THE LORD MAKES HEAVEN

The angels taken collectively are called heaven, because they constitute heaven, but yet it is the Divine proceeding from the Lord which inflows with the angels and is received by them, that makes heaven in general and in part. The Divine proceeding from the Lord is the good of love and the truth of faith. To the extent, therefore, that they receive good and truth from the Lord, in that measure they are angels and in that measure they are heaven.