Among the Pulitzer Prizes awarded in 2021 was a citation for a teenager who changed history with her cell phone. The Pulitzer committee acknowledged Darnella Frazier “for courageously recording the murder of George Floyd, a video that spurred protests against police brutality around the world, highlighting the crucial role of citizens in journalists’ quest for truth and justice.” Frazier’s act of witness received uncommon recognition, but it exists on a continuum with countless other visual documentations of injustice leveraged by activists, journalists, and bystanders to demand change. Bearing Witness, Seeking…