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ATC and Postcards
ATC, or Artist Trading Cards, are 2.5 x 3.5 inches or 6.5cm x 9cm card-stock. They are patterned after American baseball cards. They can be any medium, from digital to sculpture, but usually they are hand-drawn and colored. One side has the art and, usually, the other side has the artist'd info and signature.
Postcards come in several sizes but they are usually 4 by 6 inches. They should be mailed without envelope, the wear they receive in transit being part of the project.