The paper, called tengujo, is made by a company called Hidaka Washi, at a factory in the Kochi prefecture of Japan. The ingredients are simple, and the process is “not a very secret, special kind of thing,” Hiroyoshi Chinzei, the owner and operator of Hidaka Washi, told me recently over the phone. But the product that emerges is almost magical. The fibers knit together into gossamer lattice that i