Occasionally I "make the decision" about modifying a piece by hanging a sheet of acetate in front of the painting and roughing in the proposed additions or changes on the acetate. It's a crude method and representation, of course, but more than once the procedure has led me to decide that I didn't want to make the modification at all, or at least that I wanted it done in a different manner, and I was glad to be able to just toss the acetate. It's the low-tech version of Lon Haverly's "Undo" button.
Steven
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