At 11 x 6 inches, the sumo is the largest postcard you can mail for a first class stamp. Whenever I collect enough pieces which I believe are the best examples of my work, I assemble them into a sumo and mail to a few thousand unsuspecting art directors. You never know, it might end up on the ubiquitous "bulletin board of inspiration."  Here are 10, front and back, in descending order of publication.
The Sumo
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The Sumo

A series of large postcard mailers
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Tools