This article considers the 15M archive as a site of meaning, knowledge, experience and activism where photography plays a crucial role. Especially in its digital incarnation, such a cause-based collection becomes a retrievable myriad of images that opens the movement to a new set of questions regarding its meaning and aftereffects. For 15M was also an image-producing event, and the constellation of snapshots it generated significantly contributed to what we can consider the visuality of the Spanish crisis. The origins and nature of the photographic images that compose that 15M digital archive - the ones taken in its iconic Madrid square, in particular - also shed light on the importance of a picture-taking practice that documents and, in fact, helps to configure 15M as emerging event.