Our professor assigned a self-mailer using the rules of typography. it had to fold over itself so that it wouldn't get messed up in the mail and it had to be a duotone. We could only use two different color pantone colors, so I chose blue and orange. Above the calendar displayed is illustration and type that describes the bad rule. My self-mailer was a double sided accordion fold, with the self mailer wrapping around the front. The mailer part rips off, so what you have left is the calendar. It is appox. 3 x 5 inches.