@anon61221983, @Grey_Devil, he said the Japanese artist used long bamboo needles, dipping them in ink and leaving them in place until the whole piece was done, then removing them one by one. He said it looked like a big block of wood was standing out of his skin.
I haven’t any way of verifying any of this, and he says he was literally a drunken sailor at the time, but the guy has been 100% trustworthy and quite honest in everything else I know of.