The document discusses the concept of "significant form" in works of visual art. It states that there is an aesthetic emotion provoked by all forms of visual art, including paintings, sculptures, buildings, and other objects. The central problem of aesthetics is to discover the quality common to all objects that provoke this emotion. The document explores significant form as the only quality common to all works of visual art that move the viewer emotionally. It aims to show that significant form is what defines a work as a piece of visual art.