猫の目のように変わる

The idiom '猫の目のように変わる' (neko no me no yō ni kawaru) literally translates to 'to change like a cat's eyes.' This expression is rooted in the observation that a cat's pupils change size very rapidly and dramatically in response to light conditions, emotions, or focus. Historically, cats have been companions in Japan for centuries, and their behaviors, including their captivating eye movements, have been keenly observed. The variability and quickness of these changes made cat's eyes a vivid metaphor for anything that undergoes frequent and unpredictable alterations, such as weather, human emotions, or political situations. The phrase effectively conveys a sense of instability and fickleness, drawing on a common and easily understood natural phenomenon. It’s a descriptive and evocative idiom that has been a part of the Japanese language for a considerable time, reflecting the Japanese appreciation for nature and the nuances of observation.