In Genesis 9:13, this signifies the state of light in obscurity of the regenerate spiritual man. (Arcana Coelestia 1042)

In Exodus 13:21, this signifies a state of enlightenment tempered by obscurity in respect to truth. (Arcana Coelestia 81-86)

In Psalm 147:8, this signifies that the Lord defends and preserves the spiritual meanings of the Word by the natural truths in through the Bible's literal sense. (Apocalypse Explained 594[12])

In Isaiah 60:8, this signifies to search and investigate truth from the Word's literal sense. (Apocalypse Explained 282[5])

In Isaiah 19:1, the phrase 'Jehovah rides upon a light cloud, and comes into Egypt', signifies the visitation of the natural man from spiritual-natural Divine Truth, for a visitation is an examination into the quality of a man, and examination is made by means of Divine Truth. A light cloud denotes the spiritual-natural Divine Truth from which the quality of man as to his natural-self becomes evident.

(Референце: Apocalypse Explained 654)

Most of the time, falling means a lowering in spiritual state, from one closer to the Lord to one further. But, as with other common verbs, the meaning of "fall" is highly dependent on context in regular language, and in the spiritual sense as well. People fall on their faces in prayer, fall in battle, fall on others to attack them and fall on each other's necks in greeting. Stars fall from the sky, mountains fall on people, cities fall, and even faces fall. There's a lot of falling, in very different circumstances. When people fall on their faces in prayer -- it shows humility, and an acknowledgement of their own low state and need for the Lord's help. When they fall on each other's necks, it means a communication between the two spiritual states. At the other end of the scale, it illustrates complete spiritual destruction in the fall of a city.