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The Japanese rock garden completely renounces trees, flowers or other green plants. It is limited to idealized replicas of nature (mountains and water surfaces) only with sand, pebbles and larger rocks. These may, in the strict sense of Kare-san-sui, show a slight moss approach.
In a Japanese rock garden, the ideal number of boulders is an odd number. The numbers five, seven and eleven are preferred. The arrangement of the rocks should not reveal any geometry or symmetry. The boulders themselves should also be different in size.