The empty throne

[bi3mw]

....both classical and Christian illustrations show rainbow thrones in the range of the medieval examples. ....

Do you have any examples of this ?

Edit: Is that roughly what you mean ?
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In the Christian context I found Revelation 4:1-11.

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Then suddenly, after I wrote down these messages, I saw a portal open into the heavenly realm, and the same trumpet-voice I heard speaking with me at the beginning said, “Ascend into this realm! I want to reveal to you what must happen after this.” Instantly I was taken into the spirit realm, and behold—I saw a heavenly throne being set in place and someone seated upon it. His appearance was sparkling like crystal and glowing like a carnelian gemstone. Surrounding the throne was a circle of green light, like an emerald rainbow. Encircling the great throne were twenty-four thrones with elders in glistening white garments seated upon them, each wearing a golden crown of victory. And pulsing from the throne were blinding flashes of lightning, crashes of thunder, and voices. And burning before the throne were seven blazing torches, which represent the seven Spirits of God. And in front of the throne there was pavement like a crystal sea of glass. Around the throne and on each side stood four living creatures, full of eyes in front and behind. The first living creature resembled a lion, the second an ox, the third had a human face, and the fourth was like an eagle in flight. Each of the four living creatures had six wings, full of eyes all around and under their wings. They worshiped without ceasing, day and night, singing, “Holy, holy, holy is the Lord God, the Almighty! The Was, the Is, and the Coming!” And whenever the living creatures gave glory, honor, and thanks to the One who is enthroned and who lives forever and ever, the twenty-four elders fell facedown before the one seated on the throne and they worshiped the one who lives forever and ever. And they surrendered their crowns before the throne, singing: “You are worthy, our Lord and God, to receive glory, honor, and power, for you created all things, and for your pleasure they were created and exist.”