One day when Suiren-Shi was deep in thought, he heard a sudden burst of sound overhead. He looked up and saw a bird pecking a tree to find insects inside the bark. It led him to a sudden thought when he noticed a burst of spark when the bird pecked the bark.
He immediately found some trunk branches from that tree species and began his experimentation. He hit the branches, rubbed them... After several tests, Suiren-Shi finally found the most effective way, also the oldest way, to ignite fire. It was Fire by Rubbing Sticks.
He first looked for a sunken part on the wood or created a hole himself. He then took a sharp branch, placed it inside the hole, and rotated it back and forth by hand to create friction. Over time, this motion naturally created sparks. He then placed flammable materials like hay onto the sparks and blow gently. A fire was thus created.
