Siah Armajani (Iranian-American, 1939-2020). Lithograph on paper titled “Sound Towers,” 1972 from Armajani’s “Tower Projects,” 1969-70. Numbered 41/50, signed, and dated ’72 in pencil along the lower left. Embossed mark “M” along the lower right. Provenance: Private collection, Minnesota. Heigh; 29 1/4 in x width: 41 1/4 in.