I wondered at one time too LOL then i started making and selling them... They are miniature art... 2 1/2 x 31/2 inches or the size of a playing card. that is the standard. Fairly recent to the USA from Europe- artist trading cards - atc. were made by artists and traded but if you werent creative you never had the chance to obtain these.. soooo people started to sell them so those that couldnt get them now could. These are copies of some of my sold pieces... i am limiting them to 3 each. I do post originals also... many are collage style. BUT if i get my mind in the right frame i will begin to draw some new ones. I have a HUGE collection of these mini pieces of art from all over the world. They are incredible. You can frame them individually and put them in a group on the wall or you can frame many in one. It is a way for us to collect works of art without spending tons of money on one piece. AND not having enuf room on the walls if we could afford huge pieces. Artwork is done in all media- graphite, colored pencils, watercolor, oil, acrylic - even computer generated. have a nice weekend Jo