The box wot I made for the Lucerne Project: Special Event on Friday night. When people have finished writing their card and affixing a Lucerne address to it, they can pop it into this box, and the card will later magically be sent on its way to Switzerland.
Materials: cardboard, tape, ppost paper, glue. Thomas Hirschhorn, eat your heart out.
And here is the card that I had printed (front and back):