The images show as broken when I edit the draft, but work when I save it. Fingers-crossed they post alright!
Room 5/30 is the small, wooden floored room pictured in the painting adventurers touched to access it. The harp in the painting continues to play all on its own. Looking around the room, only the wall immediately behind the harp exists - the rest of the space is open sky. Directly behind the adventurers is a painting that looks like the room they came from; if touched it returns them to room 5/26. Below them, the wood floor remains steady as it rotates in a great gyre.
Below the floor is a large whirlpool of paper musical notation and a cacophony of music. In the center of the whirlpool is another painting that, when touched, leads to another room in this extradimensional space. Entering the whirlpool without somehow protecting one's entire body causes 1d4 slashing damage each round from waves of paper cuts. The noise in-turn sickens and disorients, requiring a Saving Throw vs Spell for each person who hears it; on failure, the character has a random ability score exhausted. An unguided trip through the whirlpool takes 1d4 minutes.