On May 12, 2019, an anonymous user posted a thread on 4chan’s paranormal board, /x/, asking contributors to share images that felt "just off." The thread collected generic pictures of dim basements and empty school halls until another user posted an uncredited photo: a canted, low-resolution shot of an office interior with sickly mono-yellow wallpaper, mismatched damp carpeting, and droning overhead lights.
A second anonymous user replied with a short text caption that immediately codified the lore:
"If you're not careful and you noclip out of reality in the wrong areas, you'll end up in the Backrooms, where
