When I began to photograph in Oaxaca, I avoided three things: Other photographers, Americans and religious ceremonies. A couple of years ago, though, after the death of my friend, Mary Ellen Mark, a few of us who were her students and friends returned to Oaxaca, to be there during the time of her annual workshops, to photograph together and to share our memories of her.

During her workshops, Mary Ellen sent students to photograph a religious procession marking the beginning of the Catholic season of Lent in Teotitlán del Valle, a foothills village on the outskirts of Oaxaca. I never went; doing so seemed invasive. This time, though, to honor Mary Ellen and to be with my friends, I rode with them to the town at dawn, when the procession began.

I took a Leica and a wide-angle lens, hoping to be unobtrusive. As the procession meandered through the village, the sun rose, scraping the cobblestones of the streets and brushing the stucco of the buildings. I stood in a shaded doorway across from a painted wall and waited for the parishioners to come to me. When they passed, I made a half-dozen frames. This is the one I kept.