It’s a metaphor once I learned in elementary school about mentioning a part of something that represents the whole thing.
When I was a little kid, it’s kind of hard for me to understand how a little part of something could make a full abstract of something. Then I learned day by day in my life how that metaphor works.
In example, when I smell a particular scent of someone, I can feel sleepy at the same time. Why? Because the scent reminds me of someone’s figure that I know can give me a comfortable feeling. Or when I hear a word “yawn”, I can suddenly do the yawn (like I do now) because I immediately imagine a face of someone yawning.
Then I realize, this metaphor also builds our common sense of something. Like, when someone mentions “apple” the first thing that might pop up in mind is Apple’s product by Steve Jobs, while actually it means the real red fruit called apple. Well, it’s just an example.
In a complex way, sometimes we even use this metaphor as an implicit statement. Commonly, we use it when we want to express our intention in a more polite way or give suppression.
Okay, enough with the intermezzo, gotta go back to my final project’s paper. Wish me luck🙂