I got this HUGE idea a while back... and I know it's sketchy but...
What if Cyan showed us the make-up of a standard Descriptive Book (like the one for Myst/Relto/Bevin)?
We could have a pre-written code/writing in the Descriptive Book you're given... and as you progress through the storyline of Uru... and learn about the Art... you can add and take from that writing and actually WRITE your own Age into existence.
Here's the catch: If something crucial is missing, the DB's Linking Panel will go black, and a message will appear as a note "linking" onto your book, telling you what may have to be added.
There can be troubleshooting from Cyan, of course.
I KNOW it's an incredibly sketchy idea... but I think EVERYONE would love it to have truly PERSONAL ages designed by, created for, and thought of by the player to be the world they could never visit before.
Comment please?