Artist trading cards (ATC's) have three rules they shouldn't be sold, they are to measure exactly 2.5" by 3.5", and on the back they must have the artist's name, contact information, title of the ATC and it's number in the series. Since M. Vanci Stirnemann started this hobby in 1997 it has spread the world over. [previously on metafilter]
posted by bigmusic on Aug 16, 2006 - 13 comments