Ryoanji Temple contains Japan's most famous rock garden. Originally an aristocrat's villa during the Heian Period, the site was converted into a Zen temple in 1450 and belongs to the Myoshinji school of the Rinzai sect of Zen Buddhism. The garden consists of a rectangular plot of pebbles surrounded by low earthen walls, with 15 rocks laid out in small groups on patches of moss. The garden's design is that from any vantage point at least one of the rocks is always hidden from the viewer. Some believe that the garden represents the common theme of a tiger carrying cubs across a pond or of islands in a sea, while others claim that the garden represents an abstract concept like infinity.