According to John, the New Jerusalem is "pure gold, like clear glass" and its "brilliance like a very costly stone, as a stone of crystal-clear jasper." The street of the city is also made of "pure gold, like transparent glass". The base of the city is laid out in a square and surrounded by a wall made of jasper. It says in that the height, length, and width are of equal dimensions – as it was with the Holy of Holies in the Tabernacle and First Temple – and they measure 12,000 furlongs (which is approximately 1500.3 miles, or 1 furlong = approx 220 yards). John writes that the wall is 144 cubits, which is assumed to be the thickness since the length is mentioned previously. 144 cubits are about equal to 65 meters, or 72 yards. It is important to note that 12 is the square root of 144. The number 12 was very important to early Jews and Christians, and represented the 12 tribes of Israel and 12 Apostles of Jesus Christ. The number symbolizes completeness in Revelation. The four sides of the New City represent the four cardinal directions (North, South, East, and West.) In this way, New Jerusalem is thought of as an inclusive place, with the 12 gates accepting all of the 12 tribes of Israel from all corners of the earth.