"一无所知" is formed through the conceptual blending of four characters where 一 (one) and 无 (none) combine to emphasize "not a single", followed by 所 (that which) and 知 (know), creating a holistic phrase that literally means "not one thing that is known". This structure originates from classical Chinese expression patterns, where the sequence intuitively builds from absolute negation to the domain of knowledge, resulting in the idiomatic meaning of knowing nothing at all. The phrase encapsulates a complete absence of understanding by sequentially negating any point of awareness, making it a fixed and evocative way to convey total ignorance.