After the Sengoku period (the Warring States period), the above-mentioned techniques developed, and they began to be influenced by the philosophy of "Zen" (a sect of Buddhism, which emphasizes focusing one's mind), and by the Chinese philosophy and medical science.
戦国時代が終わってこれらの技術が発展し、禅の思想や中国の思想や医学などの影響も受けるようになる。