Japanese Zen gardens, also known as dry landscape gardens, are carefully composed arrangements of some or all of the following: rocks, moss, pruned trees and bushes, and gravel or sand raked into patterns.  Zen gardens are normally fairly small, surrounded by walls, and meant to be appreciated from a single viewpoint outside the garden. Zen gardens were created in Buddhist temples and monasteries to serve as aids to meditation. Web resource here.

Zen garden, Ryoan-ji Temple, Kyoto, Japan. Ca. 1480.