On the mercy seat the Spirit of the Lord sits on the throne and on the right side/right hand is Jesus.He is represented as the blood because of his work on the cross.
sitting on the left side/hand on the Spirit of the Lord is the water.
The cherubim's on the Ark of the Covenant represent God's two witnesses.
Jesus is all three of these things.He is the Spirit,water and the blood.
The Holy Spirit is as a firmament, separating the water's below from the waters above.
Genesis 1:7-8
And God made the firmament,
and divided the waters which were under the firmament from the waters which were above the firmament: and it was so.
And God called the firmament Heaven. And the evening and the morning were the second day.
Having the Holy Spirit is having heaven on earth and God dwelling with men.
Matthew 25:32-33
And before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divideth his sheep from the goats:
And he shall set the sheep on his right hand, but the goats on the left.
Ecclesiastes 10:2-3
A wise man's heart is at his right hand; but a fool's heart at his left.
Yea also, when he that is a fool walketh by the way, his wisdom faileth him, and he saith to every one that he is a fool.
2 Chronicles 18:18
And Micaiah said, “Therefore hear the word of the Lord: I saw the Lord sitting on his throne,
and all the host of heaven standing on his right hand and on his left.
Our first physical birth was of water and our second spiritual birth was of the Spirit the fullness of God which is Spirit,water and the blood.
The waters below that are divided from the waters above are those who are of the world, separated from the waters above by the Holy Spirit. Even our feet can represent the waters.You have two stone tablets for feet with the 10 commandments written on them which are the toes,If you walk in God's ways.
You're spiritually walking on waters with the Holy Spirit.
1 Corinthians 15:25
For he must reign, till he hath put all enemies under his feet.
Psalm 110:1
The LORD said unto my Lord, Sit thou at my right hand, until I make thine enemies thy footstool.
Left hand, or sitting on the left hand of God can represent the Law, judgement,commandments .
Judges 20:16
Among all this people there were seven hundred chosen men
lefthanded;
every one could sling stones at an hair breadth, and not miss.