“Don’t say unnecessary things.” .... “Hey! Don’t forget the national flag. Seasoning doesn’t matter for this dish. The important thing is to put a toy flag on the hamburger.” The head chef is giving instructions to the cooks with an arrogant tone. “Listen carefully. This dish is extremely profitable at this restaurant. Why do you think it is? It’s because the dish has a toy flag on it.” What are the prerequisites for being attractive? Needless to say, the nature of attraction is still a big mystery to us. However, at least it can be pointed out that the precondition for its attractiveness is that certain characteristics remain unexplained. In other words, people’s curiosity is attracted by the fact that certain matters are not well understood. “Then, shall we put many national flags on this plate?” “That’s a bad joke. After all, the main ingredients of this dish are hamburgers, sausages, and grilled corn.” “Even a dish with extremel...