embedded paper :possible?

[Barbara Stewart]

I had a dream last night that I sent a snail-mail card to a friend. I 
spent a lot of time embedding a quasi-Java applet of a rollercoaster into 
the card, and also embedded a tiny recording of carnival sounds. I awoke 
and thought : would this be possible to do at some future date? Would 
there be a market for special "cards" or even "books" with a specific 
embedded movable graphic or video? I know that musical cards are more 
common, and a delight to receive. Why not, say, a remembrance of a happy 
event (wedding, birth announcement, etc.) ? I can imagine a lovely 
embedded wailing baby on a birth announcement card.

Possible?  And...how would we catalog such a thing? 300 field please?

Barbara Stewart
(quite aware that it's not Friday, but unable to alter her dream patterns 
to suit the list moderators ;-)    )