I have a bookmark that I made of turquoise and purple paper and box tape.
Linnea asked me what it was, I said it's a bookmark. She asked where I got it, I said I made it. She asked where I made it, I said upstairs in the kitchen. She asked if she could open it (double sided), I said she could not. She asked why she couldn't- There were too many answers to give! I think I could have been in a 'put it back, please don't mess with my things' mood, but guess what, I'm not! I said that it's just what it is, it doesn't open up. I grabbed a book and opened to a random page and showed Linnea what a bookmark is for. I tried finding a page again without the bookmark, and then with the bookmark. Both of us smiling and giggly. We were sitting next to a box of tissue, I told Linnea that my mom uses kleenex as bookmarks and grabbed another book and marked it! Linnea was amused at how that made the book look and thought it was funny... And understood that it worked the same as any bookmark. And I'm pretty sure she also understood why my bookmark didn't need any more parts or colors or layers to it.
I got back to what I was doing, computer things (as Adam Daniel would say), while Linnea was still checking it all out and playing with her stuffed toys. Then she stuck my bookmark in one of those books and asked me to guess which page she wanted, of course I opened to some unmarked pages first (since this game doesn't have rules against that), and we both laughed when I got the right page and we played again. We found a way to play with that bookmark! And a real way, with real books. That was really cool.
The books were "Memoirs of a Geisha" and "Sixty Million Frenchmen Can't Be Wrong"-- Both books I have borrowed from Linnea's parents, and both I have yet to even open... Except to show my friend why I made that bookmark.