... When your DD8 has a small bookshelf in her room, and a long shelf along her bed, but when you clear off her bedding you find four books stuffed in the case with her favorite pillow.

Also, when said DD names this, "My portable bookshelf."

Finally, when you relate the story to you DW, and she says, "That's a good one for the 'You know you're parenting a gifted child when' thread.