hand-drawn karesansui node diagram

Quick answer：

Karesansui, also known as dry landscape or Zen rock garden, is a Japanese garden style that emphasizes the use of stones and raked gravel to represent a natural landscape. A node diagram in this context would refer to a drawing that outlines the design and placement of elements within a karesansui garden. Hand-drawn node diagrams are often used by garden designers and artists to plan and visualize these gardens.