Did a progressive postcard piece at Burning Man. I started by writing my address on a postcard. I then approached other Burning Man participants at random (including some friends) and asked them write something to the stranger who had addressed the previous postcard and to address a blank postcard. One after another, I added people to the chain of postcards until, I had completed 50 postcards. I waited several months, added postage, and mailed them to the various recipients.