The traditional Mongolian dwelling is known as a ger. In the past it was known by the Russian term yurt, but this is changing as the Mongolian term becomes better known among English-speaking countries. According to Mongolian artist and art critic N. Chultem, the ger was the basis for development of traditional Mongolian architecture. In the 16th and 17th centuries, lamaseries were built throughout the country. Many of them started as ger-temples. When they needed to be enlarged to accommodate the growing number of worshippers, the Mongolian architects used structures with 6 and 12 angles[clarification needed] with pyramidal roofs to approximate to the round shape of a ger. Further enlargement led to a quadratic shape of the temples. The roofs were made in the shape of marquees.[66] The trellis walls, roof poles and layers of felt were replaced by stone, brick, beams and planks, and became permanent.[67] Chultem distinguished three styles in traditional Mongolian architecture: Mongolian, Tibetan and Chinese as well as combinations of the three. Among the first quadratic temples was Batu-Tsagaan (1654) designed by Zanabazar. An example of the ger-style architecture is the lamasery Dashi-Choiling in Ulaanbaatar. The temple Lavrin (18th century) in the Erdene Zuu lamasery was built in the Tibetan tradition. An example of a temple built in the Chinese tradition is the lamasery Choijing Lamiin Sume (1904), which is a museum today. The quadratic temple Tsogchin in lamasery Gandan in Ulan Bator is a combination of the Mongolian and Chinese tradition. The temple of Maitreya (disassembled in 1938) is an example of the Tibeto-Mongolian architecture.[66] Dashi-Choiling monastery has commenced a project to restore the temple and the 80 feet (24 m) sculpture of Maitreya.