Octagonal white operating room in the Madness castle where Houston conducts his experiments and dies.
Down a wide, unadorned hallway of white speckled tile that reminds Carl of a hospital, the theater sits directly beside The Throne Room. Its entrance is a pair of swinging double doors with a "Do Not Enter" sign and a lit neon sign reading "Amplification in process." An advanced Alarm Trap and a trap door trap guard the entrance; Carl takes both.
Inside, an octagon-shaped, starkly white room holds four surgical tables ringed by a raised viewing area for students, with The Grease Monkey hanging from the high ceiling. The fourth table is drenched in twenty gallons of blood with the source gone and a white Cleaner Bot slurping it up. The other three hold Zeynep's corpse, the living Burcu, and Namico fused to Architect Houston. Eight Containment Breach Trap Mark IV modules line the observation deck. When they fire, the whole room and then the castle go up in Sheol Fire.
A crisp octagonal white room with four surgical tables in the middle, a raised student viewing gallery around them, brilliant lighting, and a chrome robotic chandelier overhead.
The heart of Houston's experiments and the site of his death and the Madness's fall.