The First Sphere, the Second Sphere, and the Third Sphere.
The First Sphere is an infinite cosmos, stars and nebulas line the halls, doors to glorious rooms are nebulas guarded by the cherubim, and the gargantuan rings make paths that the hypernova ophanim spin down wherever they please. The seraphim, serpents flaming with starlight, with black hole faces concealed by nebula wings and bodies composed of constellations, sing praises to God here, spinning and dancing for eternity. Bonus:
Aziraphale, in his True Form. Armor is a contained, eternal solar flare, with a sun at his core. I like imagining that he used to guard a burning star that a high ranking Seraph prized. He and the Ophanim that was assigned to him (since cherubim and ophanim are paired) never got along.
The Second Sphere houses angels that seem mysteriously absent from the bizarre geometric maze of mirrors. This isn’t the case; since the Second Sphere is responsible for the management of physical law and miracles on Earth, every angel is spread out as thinly as possible, their consciousness refracted in every surface; from the tiniest spinning electrons to notifying Gabriel that 40 policeman have gone to sleep, the Second Spheres need to know what’s happening, and make sure that everything is going in working order. If someone goes into the Second Sphere and sees no angels, be warned: all of them see you.
The Third Sphere is an ocean; the cradle of life, as it were. The holy water, the Flood water, when it comes to Earthen affairs, it will always come back to the water, where life first came. The angels of the Third Sphere are under the jurisdiction of the Archangels. The principalities, the archangels, and the angels are all mostly aquatic in nature, their appearance ranging from the beautiful comb jelly to a strange yet graceful basket star, to a many eyed kronosaurus. If fossils were jokes that scientists haven’t picked up on, these are what’s being referenced. The result of the first “organic” life. As well as angels, there are things resembling thermal vents, which burn with holiness, and third spheres cluster around them to share company in between giving humans divine visions. Thankfully (or not), most of these third sphere angels are well equipped for human interaction! Like angler fish, these angels have a bioluminescent attachment that doesn’t look unlike the Sea Butterfly, hanging on the end of an appendage. Its mouth moves, and it delivers messages to humans through a softly glowing image of what appears to be a winged humanoid. Nothing to fear!
(Sometimes, when a human’s sight is too keen, they see… something else. Behind that beautiful vision.)