The idiom "从头到尾" (cóng tóu dào wěi) is formed through a logical spatial metaphor, combining the preposition "从" (from) with "头" (head) and the preposition "到" (to) with "尾" (tail) to create a literal meaning of "from head to tail". This structure visually maps the entirety of a physical creature onto a temporal or sequential process, thus figuratively expressing the idea of "from beginning to end", "thoroughly", or "the whole thing", capturing completeness in time, narrative, or action.