"一目了然" literally means "clear at a glance," describing something—a matter, a situation, or a truth—that is so obvious that it can be understood without careful analysis or deep thought. This idiom originates from Zhu Xi's *Classified Conversations of Master Zhu* (Zhuzi Yulei) of the Southern Song Dynasty, where the original text reads, "After seeing the principle thoroughly, it is clear at a glance," emphasizing that once one has a thorough understanding of a principle, one can see the whole picture at a single glance. In terms of usage, it is often employed to describe charts, instructions, layouts, logical relationships, and the like that are clear and easy to understand; it can also describe a person's intentions or a situation that is transparent and evident. Its emotional tone is neutral or positive, carrying a sense of appreciation for clarity, conciseness, and directness. In terms of cultural background, it reflects the traditional Chinese cognitive preference for "simplicity and intuitiveness," standing in contrast to expressions such as "a single leaf obscures the view" or "looking at flowers through the mist." Its deeper meaning refers not only to visual clarity but can also be extended to mean transparency in thinking and clarity in reasoning, emphasizing the efficiency and directness of information transmission.
📝 Example
1. This flowchart is designed very clearly, with every step being immediately clear at a glance. (Describes a chart that is clear and easy to understand, comprehensible at a single glance.)
2. He explained the whole sequence of events so clearly that everyone present could see it at a glance. (Describes a situation or reasoning that is very obvious and can be understood without further explanation.)