Showcard Series documents the many conceptual structures that shaped their work at the time and contains ideas the group advanced in subsequent projects. The cards feature handwritten text together with photographs by the artists, including ones that they had taken of popular magazines. General Idea considered these photographs works in themselves, rather than reproductions. There are also images of reviews of General Idea’s work, as well as a few photos by other artists, which had been created for mail art networks—a means of engaging artists in a conversation about General Idea’s projects.