In contrast to the "stupas", the hollow "gu"-style temple is a structure used for meditation, devotional worship of the Buddha and other Buddhist rituals. The "gu" temples come in two basic styles: "one-face" design and "four-face" design—essentially one main entrance and four main entrances. Other styles such as five-face and hybrids also exist. The one-face style grew out of 2nd century Beikthano, and the four-face out of 7th-century Sri Ksetra. The temples, whose main features were the pointed arches and the vaulted chamber, became larger and grander in the Pagan period.