Terry Fugate-Wilcox, 3000 A.D. Diffusion Piece, 1972–74, aluminum, magnesium, steel, and concrete, 40 x 3 x 1 ft. (photographer unknown; image sourced from Wikiwand)

The sculpture, commissioned by the New York City Department of Cultural Affairs in 1972 and installed in 1974, is located in J. Hood Wright Park in the Washington Heights neighborhood in upper Manhattan.