Artist Dale Eldred's assistant installing sand to pendulum sculpture in Kirkhof, 1975.

Artist Dale Eldred's assistant installing sand to pendulum sculpture in Kirkhof, 1975.

Artist Dale Eldred's assistant installing sand to pendulum sculpture in Kirkhof, 1975.

Artist Dale Eldred with President Lubbers after installing pendulum sculpture in Kirkhof, 1975.

Artist Dale Eldred's assistant installing sand to pendulum sculpture in Kirkhof, 1975.

Black and white photograph of the falls from Artist's Point at Yellowstone National Park (mile 17601).

Black and white photograph of a group of young men holding signs and candles at night during the artists' protest parade in New York City, New York. Scanned from the negative.

Black and white photograph of a man smiling while holding a candle in the middle of a crowd during the artists' protest parade at night in New York City, New York. Scanned from the negative.

Black and white photograph of a group of men smiling and holding candles during the artists' protest parade at night in New York City, New York. Scanned from the negative.

Black and white photograph of a group of protestors smiling and singing while holding posters and candles during the artists' protest parade at night in New York City, New York. Scanned from the negative.

Black and white photograph of a group of men holding posters and candles at night during the artists' protest parade in New York City, New York. Scanned from the negative.

Black and white photograph of a protestor with a poster hung around his neck, a cigarette in his mouth, and a candle in his hand during the artists' protest parade at night in New York City, New York. Scanned from the negative.