http://www.1000journals.com/

''From the site ...''

One thousand blank journals are traveling from hand to hand throughout the world. Those who find them will add stories and drawings, and then pass them along. This is an experiment, and you are part of it.
   

http://www.1000journals.com/images/com/526returns.jpg

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See also WikiLikeThing, http://www.phototag.org