Aesthetics is a subject with the theme of studying the essence and significance of beauty. It is a branch of philosophy and belongs to the category of philosophy. The main object of research is art, but it does not study the concrete expression in art, but the philosophical problems in art, so it is called the artistic philosophy of beauty. The basic problems of aesthetics include the essence of beauty, the relationship between aesthetic consciousness and aesthetic objects, etc. The word "aesthetic" comes from Greek, and its original meaning is sensory experience. The German philosopher Alexander gottlieb Baumgarden first used this word. The publication of his book Aesthetics marks the emergence of aesthetics as an independent discipline. Until19th century, aesthetics was usually defined as the theory of studying beauty in the concept of traditional classical art, while modern philosophy defined aesthetics as the theory and philosophy of understanding cognitive feelings in art, science, design and philosophy. The aesthetic value of an object is not simply defined as beauty and ugliness, but to understand the type and essence of the object.