The panopticons (plural intended, since there is one located within each canton of Astrarium) are believed to be located in what would have served as the 'head' of each of the Worldweavers. Each is dominated by a construct that is, in some way, indicative of the current state of the cosmos that the trio fashioned, and the cantons take their names from what functions it is easiest to keep track of in each construct.
Supposedly the constructs were already present when the city-world was first discovered and the custodians first founded. Unlike most buildings, which are almost never re-used, the Orreries have been in constant use since their discovery, with a new Custodian moving in whenever their current caretakers die. The constructs are simply too useful for the building to lie empty and it to become forgotten.
Experimentation on the constructs has confirmed that each one possesses some level of sentience (suspected to be remnants of the consciousnesses of the Worldweavers themselves), but only the most ancient, patient, and strong-willed of the Custodians have found attempts at communication to be safe and comprehensible, and they all report that the communications are far closer to observing something's dreams than actually have its attention.
The scrying devices in the room aren't really owned by any particular individual, but rather tend to be dropped off in the room whenever a custodian acquires a scrying device (as very few of members of the order actually feel any need to keep scrying devices, given their own capabilities).
"I... I..." The man blinks in confusion, his thoughts whirling. I'm not dead? But... then that must be one of the Custodians, not whoever set that trap. Oh thank the heavens! Wait. I just pulled a knife on one of the custodians. Oh damn oh damn. Will they let my family live when the kill me? Maybe he hasn't noticed yet. Slowly he lets go of the hilt of his knife, letting it slip back into the sheath. Track my steps? But then they'll see about her and me and oh no, I swore no one would find out, surely there's some way to keep it from coming up... focus on business then, don't let them see your fear Edric! "We had just started the viewing when I noticed the water in the cauldron start to boil off, sir. I knew that wasn't supposed to happen, but before I had a chance to say anything, Decklan and Maria were dead. It must have been a ward, but the cauldron should have filtered that out, kept them safe." That damned dragon didn't warn us there might be something warding the scene! What if the cauldron had blown up? I might have been killed!
While everything he says seems true (there's no contradictions in his thoughts, or other signs of deceit), there's a few oddball things. For instance, while he seems sad about Maria's death, there's something closer to a sense of pleasure or relief at Decklan's.