Double Écriture Noir et Vert (“Double Writing in Black and Green”) (1966) exemplifies Soto’s exploration of perception, movement, and optical illusion. The title, “double writing,” refers to the layered lines in black and green that are intentionally displaced from one another. This displacement creates an interactive visual experience as the viewer’s movement alters the appearance of the lines: they may seem to merge, shift or even vanish, depending on the observer’s angle.

Soto’s work challenges the traditional boundaries between two-dimensional and three-dimensional space, inviting viewers to become active participants in the artwork. Rather than a static piece, Double Écriture Noir et

Vert engages viewers through optical play, highlighting Soto’s interest in creating art that changes based on perspective and motion. The viewer’s position directly influences their perception of the layered lines and colors, transforming a simple repetition of lines into a dynamic, immersive experience.

Through this optical interaction, Soto examines the instability of visual forms, using the interplay of lines and colors to question ideas of permanence and movement in art. Double Écriture Noir et Vert blurs the lines between the artwork and its observer, embodying Soto’s vision of art as an experience shaped by active engagement and perception.