The postcard is one of the most flexible and ubiquitous forms of art. When traveling, the image on the postcard you send says as much about you feel and what you’re doing as the words you wrote on its flip side. Em Space Book Arts Center (407 SE Ivon St.) is taking the postcard to the gallery with its new show, P.S. An Exhibition of Postcards, which runs from September 19th (opening party from 6-9 PM) through Halloween, featuring more than forty local and regional artists all working in the familiar confined space of 3.5" by 5". The variety in techniques used alone for the postcards (letterpress, silkscreen, lithography, collage, and photography) will make checking it out worthwhile. Even better, this is a gallery showing where you almost have to take something home—no piece will cost over $5.