To be a fan is to be a perpetual collector, and that doesn’t just mean autographs or action figures. Acquisition is an important part of many fans’ lives, from the material, such as concert merch or rare comic cover variants, to the intangible—facts, memories, interpretations, arguments, ideas. They save images, curated and annotated lists of fanfiction, data about fictional universes for wikis, clips from their favorite shows for vids. They deconstruct their obsessions, and build something new from all the little pieces. Sometimes they do this alone, but often, they do it together—the shared act of creation often defines a fandom.