Now for a custom that gives the bridge a living, human role. Just to the west stands Horin-ji temple, where children who have turned 13 go to pray for wisdom and good health. This tradition is called Thirteen Visit, or Juusan-mairi, and it is said to have begun in 1773. The rule is the fun part. On the way home you must cross Togetsu Bridge, and until you reach the far end you must not turn around. Legend says that if you look back before you finish crossing, the wisdom you were just granted is handed back. Picture a thirteen-year-old marching across 155 meters of bridge, staring straight ahead, resisting every urge to glance over a shoulder. As you walk here yourself, notice how the bridge is built. The railings are designed to blend into the Arashiyama scenery, and the structure is built on reinforced concrete piers and girders. Just beyond the southern end, a smaller companion bridge called Togetsu Kobashi crosses the next channel. It is 19 meters long, and its center is raised by 10 centimeters in a gentle curve. Its banks were raised by about 75 centimeters to guard against floodwater.