It is believed that the oldest tiles found in Japan are from the 6th to the 7th century, when Asukadera temple was built. These tiles were placed over the roofs to protect buildings from wind and rain, before developing into its current form and usage. At the time, ceramic tiles were extremely valuable. Whenever the capital was relocated these tiles would be removed, transported to the new location, where they would be selected and placed over the new buildings. It is said that these tiles can last about 1,000 years, but due to the deterioration in appearance they are generally replaced every 150 years.