zen garden sand circles forming a calming spiral with peebles, a serene meditation space surrounded by green shrubs

zen garden sand meditation peaceful circles sand spiral design pebbles tranquility serene calming mindfulness simplicity balance natural beauty green shrubs minimalist nature meditation space relaxation concept landscape art pattern spiral peace nature japanese garden harmony relaxation area aesthetics quiet place reflection tranquility minimalism serenity green inspiration spiritual outdoor peaceful environment philosophy retreat energy spiritual calming reflection soothing formation soothing peacefulness landscaping pebble zone sanctuary serenity circle smooth calm retreat