9780415263573

If you translate the title on a ISBN Book code, the title translates to a book named The Yellow Wallpaper, the same color of the Backrooms. "The Yellow Wallpaper" is a book about a woman's mental health deteriorating, while on a "rest cure" with her family. She's obsessed with the yellow wallpaper in her room (which resembles a lot the tone of yellow in the Backrooms), which points to her fall into psychosis and depression throughout the book.