Islam inherited the millennial experience in various forms of technology from the peoples who entered the fold of Islam and the nations which became part of Dar al-Islam. A wide range of technological knowledge, from the building of water wheels by the Romans to the underground water system by the Persians, became part and parcel of the technology of the newly founded order. Muslims also imported certain kinds of technology from the Far East such as paper which they brought from China and whose technology they later transmitted to the West. They also developed many forms of technology on the basis of earlier existing knowledge such as the metallurgical art of making the famous Damascene swords, an art which goes back to the making of steel several thousand years before on the Iranian plateau. Likewise Muslims developed new architectural techniques of vaulting, methods of ventilation, preparations of dyes, techniques of weaving, technologies related to irrigation and numerous other forms of technology, some of which survive to this day.