Karesansui and sand rake

Quick answer：

Karesansui, also known as dry landscape garden, is a traditional Japanese garden style featuring rocks arranged in patterns symbolizing mountains and seas, often with raked sand to represent water. A sand rake, or kensui, is a gardening tool used to raked the sand in these gardens, creating ripples or waves to represent water movements. It is a crucial element in maintaining the aesthetic of karesansui gardens.