Your abive response to my reply below:
well, if you are specifically referring to verse 8, then remember that there are 3 heavens; the first is the
sky or the upper atmosphere which is what verse 8 is referring to as that first heaven and the second is that universe as in outer space, and the third is God's throne which exists outside the reality of the heavens and the earth.
So that firmament in verse 8 is that first heaven. ~~ end of my quote
What categories do not exists? The 3 heavens? Then explain why God's throne is considered the third heaven and what differentiates as the first and second heaven then?
2 Corinthians 12:2 I knew a man in Christ above fourteen years ago, (whether in the body, I cannot tell; or whether out of the body, I cannot tell: God knoweth

such an one caught up to the
third heaven.
In the context of 2 Corinthians 12:1-5, Paul was testifying "indirectly" about the apostle John and that book of Revelation.
Revelation 1:9 I John, who also am your brother, and companion in tribulation, and in the kingdom and patience of Jesus Christ, was in the isle that is called Patmos, for the word of God, and for the testimony of Jesus Christ.
10 I was in the Spirit on the Lord's day, and heard behind me a great voice, as of a trumpet,
11 Saying, I am Alpha and Omega, the first and the last: and, What thou seest, write in a book, and send it unto the seven churches which are in Asia; unto Ephesus, and unto Smyrna, and unto Pergamos, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea.
Do you have another application for the third Heaven as not being God's throne? Or do you have another explanation other than the first heaven being the sky or upper atmosphere and the second heaven being outer space?