Artist trading
cards (ATCs) is a concept initiated by the Swiss artist M. Vänçi Stirnemann in 1997. Artist trading cards are 2 1⁄2 by 3 1⁄2 inches (64 mm × 89 mm) in size, the same format as
modern trading cards (baseball cards). They are self-made unique works of art, signed and
dated on the reverse by the artist. The finished cards are exchanged and
collected.
