In this clip from SALT, photographer Murray Fredericks says that the physical exertion of being on Lake Eyre gives him ideas for photographs. His goal is to create photographs that give the sense of total immersion into the void of Lake Eyre. Note: This video is only available in low quality.

In his search for "somewhere I could point my camera into pure space," award-winning photographer Murray Fredericks began annual solo trips to remote Lake Eyre and its salt flats in South Australia. Made in collaboration with documentary filmmaker Michael Angus, "SALT" is the film extension of Fredericks' work, interweaving his photos and video diary with time-lapse sequences.

Roberto Hernandez and Layda Negrete, who call themselves "accidental filmmakers," explain how they met their subject Tono, what turned them into "lawyers with cameras" and what their hopes are for the Mexican justice system.

Follow the struggle of two young lawyers to free a man wrongfully convicted of murder in Mexico City. 8/23/2012

Imagine being picked up off the street, told you have committed a murder you know nothing about and then finding yourself sentenced to 20 years in jail. In December 2005 this happened to a young man in Mexico City and, like thousands of other innocent people, he was wrongfully imprisoned.

Mexican intellectuals Carmen Boullosa, Cuauhtemoc Medina and Jean Meyer reflect on a quote by Chris Marker, considering Mexico's history and how it is reflected in the present.

Mexican intellectuals Carmen Boullosa, Cuauhtemoc Medina and Jean Meyer reflect on a quote by philosopher Hannah Arendt and consider Mexico's history and how it is reflected in the present.

Mexican intellectuals Carmen Boullosa, Cuauhtemoc Medina and Jean Meyer reflect on a quote by former Mexican president Plutarco Elias Calles and consider Mexico's history and how it is reflected in the present.

Mexican intellectuals Carmen Boullosa, Cuauhtemoc Medina and Jean Meyer reflect on a quote by Mark Twain and consider Mexico's history and how it is reflected in the present.

Mexican intellectuals Carmen Boullosa, Cuauhtemoc Medina and Jean Meyer reflect on a quote by author Octavio Paz and consider Mexico's history and how it is reflected in the present.

Filmmaker Natalia Almada talks about "El General," her poetic meditation on history, memory and family. The film brings to life audio recordings she inherited from her grandmother, daughter of Plutarco Elias Calles, a revolutionary general who became Mexico's president in 1924.

Past and present collide as filmmaker Natalia Almada brings to life audio recordings she inherited from her grandmother, daughter of Plutarco Elias Calles, a revolutionary general who became Mexico's president in 1924. "El General" moves between a daughter's memories of her father as she grapples with history's portrayal of him and the weight of that same man's legacy on Mexico today.

Wangari Maathai is a Kenyan environmental activist who founded the Green Belt Movement, which trains rural women to plant trees, combat deforestation and generate income for impoverished communities. In this 2010 interview, Maathai explains Green Belt's holistic approach to addressing poverty. Maathai passed away on Sept. 25, 2011 at the age of 71 after battling ovarian cancer.

Amartya Sen is the winner of the Nobel Prize in Economics for his work in welfare economics. Sen talks about how we can all work to make each others' lives better, and focuses specifically on the organization FXB International, which empowers children affected by AIDS in impoverished communities by strengthening families and communities.

"Good Fortune" is a provocative exploration of how massive international efforts to alleviate poverty in Africa may be undermining the very communities they aim to benefit. The gripping stories of two Kenyans battling to save their homes from large-scale development present a unique opportunity see foreign aid through eyes of the people it is intended to help.

Filmmakers Landon Van Soest and Jeremy Levine talk about their film, which focuses on two stories of international aid in Kenya where good intentions go wrong. Van Soest and Levine explain how they came to make the film, why the two characters they focused on are emblematic of their respective communities and talk about the paternalism with which the West deals with developing nations.

Filmmaker Yoruba Richen talks about the making of "Promised Land," which looks at land reform in South Africa and follows two black communities trying to reclaim land from white owners.

Though apartheid ended in South Africa in 1994, economic injustices between blacks and whites remain unresolved. As revealed in Yoruba Richen's incisive "Promised Land," the most potentially explosive issue is land.

Agnes Varda talks about acting for the first time and her process as a filmmaker. She elaborates on the theme of beaches: the beaches in Belgium and her childhood to the beaches of California and France. Varda's personal charm shines through in this delightful companion piece to "The Beaches of Agnes."

In this new online-only series, we'll be featuring current and past interviews with some of the most influential documentary filmmakers. First up are Louis Alvarez and Andrew Kolker, the filmmakers behind "American Tongues," the film that kicked off POV in 1988. They talk about how nonfiction filmmaking has evolved over the past three decades.