The Idea Becomes a Machine: Sol LeWitt's Wall Drawings
In 1967 Sol LeWitt wrote that the idea becomes a machine that makes the art — then handed wall drawings to other hands.
In the summer of 1967, in Artforum, Sol LeWitt set the terms: "In conceptual art the idea or concept is the most important aspect of the work." Planning and decisions come first; execution is "a perfunctory affair." Then the line generative artists still quote: "The idea becomes a machine that makes the art."
His wall drawings put that sentence on the wall. LeWitt made the first one by hand in 1968, then almost immediately began delegating execution to hired artists working from certificates and diagrams. Buyers receive a plan, not a portable object. Trained drafters supervise local teams so the instructions stay intact while the work adapts to each room. SFMOMA's Cristina Chan, writing in March 2026 about a new Fisher Collection hang, notes that Wall Drawing #273 (September 1975) still leaves drafters to choose how many lines to draw and where each ends — so the piece changes with every install, even as the concept holds.
That is the useful link to generative practice: a rule set that produces the work, with room for variation inside the plan. LeWitt was not writing software. He was writing instructions that other people — or, later, other systems — could run. Calder, Kelly, LeWitt: Fundamentals of Form opens at SFMOMA on April 18, 2026, with six wall drawings spanning from Wall Drawing #1 (1968) to Wall Drawing #1237 (2007).
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