I remember seeing pictures of a "lounge" in the middle of the TNG corridors - the set for engineering included connections to the curved corridor set just outside the isolation door, and a shortened straight corridor at the rear of the set, where they had the large Engineering MSD. Occasionally, they would remove the MSD and "pool table", close the isolation door, stick a couple of chairs and potted plants and unplug the hallways and you get an instant lounge. I'm trying to find reference pictures for a project, but google images is coming up short. Even episode names would help. Thanks!