艺廊这件作品还在版权期内本站只列资料、不放图，可以到下面的链接看原图。
Double Negative
Double Negative is a piece of land art on the eastern edge of Mormon Mesa, overlooking the Virgin Valley, in rural Clark County, Nevada. It consists of a pair of trenches facing each other across a canyon. Double Negative was created in 1969 by artist Michael Heizer.
摘自英文维基百科「Double Negative (artwork)」（CC BY-SA 4.0），暂时没有中文条目。