What are ATCs?
Artist trading cards (ATCs) are small works of art (2.5" X 3.5") that are traded (never sold) between artists. They can be made from any material/medium and using any creative technique.
ATCs were originally conceived in 1996 by a Swiss artist, M. Vanci Stirnemann. It is said that he wanted artists to be able to exchange art without the constraints of the gallery setting or concerns about pricing.
Rules and Guidelines
The only rules are that they must be exactly 2.5" X 3.5" (so as to fit into plastic trading sleeves) and they may only be traded, not sold. Beyond that, certain artists and groups prefer that the cards be rigid enough to not bend when propped up. Cardstock thickness is typical while some artists like to work on heavier base materials like illustration board. More than anything else ATCs are for Fun and Expression!