Japanese garden Nice small tsubo-niwa. Also, VERY intersting arrangement of the 3 rocks in the center. More equivalently spaced than normal, and unless you're supposed to look at it from the bottom L, also an unusual structure - 3 rocks with 1 tall & narrow, 1 low, long and large, and one low, round and small is standard, but having the round small one furthest back, and the tall one so far to the right instead of sort-of-but-not-actually centered between others are both unusual choices.
Small courtyard gardens known as tsubo niwas became popular in Japan during the 15th Century. The gardens were common in Japanese cities and were often found at the homes of wealthy merchants. These small gardens are still popular today especially where space is at a premium. These intimate spaces are created to provide a serene entrance to a home and are based on the principles of Japanese Zen Garden.