It's a fantasy role-playing game.

DM: You are Vax Vax'ildan, a half-elf rogue . You are the member of the famous group of adventurers. Previously, There is the sound of stone grating once again, but the glass walls do not move. Instead, two large bronze tubes push outwards into the room.
DM: Sylas leans forward and puts his hand to the glass and says, "And hello to you, too. And welcome to all of you. Well, my dear." At which point Delilah steps forward and goes, "I was hoping for a more formal reunion, but you insisted on riling up the populace and tying up the bulk of our forces. Rather unfortunate, really."
Player: Now, the door's open behind them, right? If I use perception, do I see anything behind them, any switch or lever or anything?
DM: Go ahead and make a perception check.
Player: 20.
DM: 20. Looking across the way, but barely able to peer past them with very little light in the distortion of the glass, you can see what seems to be some sort of a smooth stone placard that's embedded in the wall just on the other side of the door.
Player: Just outside the door.
DM: Yeah.
