"I never make preliminary sketches. Instead, I work out systems of constraint that govern the evolution of the drawing without eliminating free choice. (A fully constrained drawing, where the outcome is determined in advance, would not be worth executing.) By systematically limiting my options, I can create specific ranges and types of freedom. The visual consequences are often unexpected.

There is no uniquely prescribed course of action. At every moment it is possible to imagine the drawing extending into a variety of futures. My decision to follow any one course closes off many others of equal interest and validity. Conflict and mediation. Some process of selection is called for that does not reduce to rules."
- Robert Horvitz on his drawings