The title *The Ethics of Leisure and Boredom* may seem intimidating at first glance, but simply put, this is a book that explains what leisure means for modern people, when and why people feel bored, and how to enjoy life in leisure and face boredom with ease.

Abstraction Ladder, first proposed by S.I. Hayakawa (1949), is a concept that outlines the rules of language, cognition, and how we express our cognition through language. It's not only applicable in linguistics but can also help us think more deeply about various things in daily life.