This paper redefines "expertise"—the advanced state of skill or judgment—from a non-linear and structural perspective grounded in Kakushin Structural Theory. Rather than viewing expertise as the smooth accumulation of experience or knowledge, we propose that it emerges when “structural shards” are silently accumulated and reorganized in the unconscious domain, surpassing a critical threshold. This process results in the spontaneous formation of judgment criteria, often recognized by the individual only after the fact as a sense of “I realized I could do it.” We theorize this phenomenon as the static operation of "Mindflight Structure," characterized by silent kakusen (non-conscious recognition) and quiet shunten (non-conscious structural fixation). Furthermore, the paper explores the conditions under which such expertise can be reproduced, offering a framework for educational and cognitive design. Ultimately, this study functions as an internal validation of the broader theoretical system of Kakushin Structural Theory, demonstrating that its core constructs—mindflight cognition, kakusen, shunten, and structural shards—correspond to empirically observable cognitive phenomena. Expertise is thus redefined as the state in which structure becomes one's world.
HIDEKI (Wed,) studied this question.