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What is mail art?
Mail art can be just about any type of art including painting, water color, pencil, marking pen, collage, rubber stamp, or photograph on an envelope, postcard, package, or other medium. It can also be a three-dimensional piece. Any piece of art that is itself stamped and addressed. Normally, the art is not enclosed in an envelope or package, but rather is on the envelope or package. Ideally we can hang the piece on the wall or display it on a shelf just as it arrives through the mail. You can also design your own postage stamps, perhaps for a country that you make up.
A mail art envelope from the Ben Franklin mail art event