1. ATCs and ACEOs

2.  Artist trading cards (or ATCs) are miniature works of art about the same size as modern baseball cards,or 2 ½ X 3 ½ inches small enough to fit inside standard card-collector pockets, sleeves or sheets.  Cards are produced in various media, including dry media (pencils, pens, markers, etc.), wet media (watercolor, acrylic paints, etc.), paper media (in the form of collage, papercuts, found objects, etc.) or even metals or cloth.  The cards are usually traded or exchanged.

8.  When sold, ATCs are usually referred to as art card editions and originals (ACEOs).  An offshoot of artist trading cards are art card editions and originals (ACEOs), which originated when some artists began to create cards to sell, in addition to trading among themselves. Many ACEOs are sold on internet auction sites, such as eBay.