I recently learnt about Mail-Art in a 'MOOC Introduction to Art Course' that I enrolled for on www.coursera.org. If you're interested in finding out more about the history of mail-art you might want to google: 'Ray Johnson'; 'Ruud Janssen'; Project Braincell'; or head over to the International Union of Mail-Artists website.
I found the mail-art movement to be extremely interesting and have decided to join in the fun!
Here are my first 2 pieces of mail-art that'll be making its way into the postbox tomorrow.
First Envelope
Front View:
Back view:
Second Envelope
Front View:
Back View: