The Dewey Decimal Classification system divides materials into 9 main classes, each with 9 divisions and 9 sections, represented by a 3-digit call number. The 700s class covers art and recreation materials. It includes fine arts, decorative arts, architecture, sculpture, drawing and design, painting, engraving, photography, and recreational and performing arts. The document provides examples of the divisions and sections within the 700s class and art subdomain call numbers.