Even before the Women’s March last Saturday was history, the archivists at the Newberry Library suspected it would be historic. They put out a call for Chicagoans to send in photos and bring their signs, their buttons, their pussyhats, and whatever other materials they carried with them to the library to be preserved forever in its archive.

The library began putting out calls for materials on social media on Friday; the response was immediate and overwhelming. “It’s cool to walk down the street to get a coffee and see people bringing stuff in,” Teller says. The materials he’s seen coming into the library have been representative of what he saw at the march on Saturday: references to Star Wars (the portrait of Princess Leia with the slogan “A woman’s place is in the resistance”) and plenty of pussyhats. People who submit photos will have the opportunity to add their own captions to tell their stories.