I know that I (yes, that's me), sure stamped a lot of the fashionable little red Passports that almost everyone carried around, held open for the next artist to do his thing. The marks, between the artists, was a magnificent spectrum of thoughts and musings declaring their own ID and/or message or idea. As you can see, I was happily attired in my vintage Happy Coat I acquired from early 1970's Tokyo.
The special Test Tower "'EX Postal Facto" rubber stamp I was using. And I used it alot - I had to blow on it a couple of times to cool it down from so much jolly usage!
Cappucino and Art Journal.. See you in the mail my friend!