This paper presents the concept of "visual knowledge." Visual knowledge is a new form of knowledge representation that is different from all other visual representations or knowledge represen-tations that have emerged in artificial intelligence (AI) development. A visual concept is composed of prototypes, category structures, hierarchical struc-tures, action structures, etc. It can further constitute a visual proposition, incorporating scene structures and their dynamics, and the visual proposition can then be used to narrate a visual scene. This paper suggests that careful utilization of developments from computer graphics technology will contribute to realizing visual knowledge representation, and to its reasoning and analysis, and that careful utilization of progression from computer vision will promote the leaing of visual knowledge. Representation, reasoning, lea-ing, and utilization of visual knowledge will form a key step toward remarkable breakthroughs in the era of AI 2.0.