The most famous of all zen gardens in Kyoto is Ryōan-ji, built in the late 15th century where for the first time the zen garden became purely abstract. The garden is a rectangle of 340 square meters. Placed within it are fifteen stones of different sizes, carefully composed in five groups; one group of five stones, two groups of three, and two groups of two stones. The stones are surrounded by white gravel, which is carefully raked each day by the monks. The only vegetation in the garden is some moss around the stones. The garden is meant to be viewed from a seated position on the veranda of the "hōjō", the residence of the abbot of the monastery.