Cy Twombly, Untitled, 27 May 1970, crayon, graphite pencil, ink, tape, and cut and torn paper on colored paper. The Menil Collection, Houston; Gift of the artist. Photography by Paul Hester ©Cy Twombly Foundation

Cy Twombly, Untitled, 27 May 1970, crayon, graphite pencil, colored pencil, ink, tape, and cut, torn, and folded paper on paper. The Menil Collection, Houston; Gift of the artist. Photography by Paul Hester ©Cy Twombly Foundation

Cy Twombly, Untitled, 28 May 1970, crayon, colored pencil, ink, tape, and cut, torn, and folded paper on paper. The Menil Collection, Houston; Gift of the artist ©Cy Twombly Foundation

Cy Twombly, Untitled, 28 May 1970, graphite pencil, crayon, colored pencil, ink, tape, and cut, torn, and folded paper on colored paper. The Menil Collection, Houston; Gift of the artist. Photography by Paul Hester ©Cy Twombly Foundation

Cy Twombly, Untitled, 1970, graphite pencil, colored pencil, oil, crayon, tape, printed and photographic paper, and plywood on cardboard.The Menil Collection, Houston; Gift of the artist. Photography by Paul Hester ©Cy Twombly Foundation

Cy Twombly, Treatise on the Veil (Second Version), 1970, oil-based house paint and wax crayon on canvas. The Menil Collection, Houston. Photography by Erika Barahona Ede, ©FMGB Guggenheim Bilbao ©Cy Twombly Foundation