He advocated for the development and widespread adoption of technology in his "Giye-ron" (Treatise on Technology). He believed, “The more people gather, the more sophisticated their skills become, and as generations pass, those skills become increasingly refined.” He emphasized the importance of learning techniques from a broader world and acquiring new skills, stating that this is essential for achieving abundance and longevity. By exploring the various facets of Da-San's career—as a civil engineer, architectural engineer, mechanical engineer, and more—it becomes clear that he was indeed the greatest engineer of the Joseon Dynasty.