Japanese Zen rock gardens, known as 'karesansui', are traditional Japanese gardens that use carefully arranged rocks, sand, and sometimes moss to represent a natural landscape in miniature. The design typically includes elements such as pebbles or sand raked into patterns to symbolize water, as well as rocks arranged to represent islands and mountains. These gardens emphasize the beauty of simplicity and the interplay of natural elements. The design diagram would illustrate the layout and composition of such a garden, showcasing the arrangement of stones and other elements to create a serene and contemplative space.