Artist trading cards (or ATCs) are miniature works of art : 2 ½ X 3 ½ inches (63 mm X 89 mm), 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.
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