The Precision of a Dutch Hand To look at the work of Cor Heeck is to witness a disciplined command over diverse media. He was not a specialist who stuck to a single tool; instead, he moved through the roles of watercolorist, painter, draftsperson, pastellist, etcher, and graphic artist with a technical fluency that suggests a lifetime of rigorous practice. His output reflects a commitment to the formal qualities of line and color, whet…