Typically, to achieve this Japanese naguri (literally "beaten") pattern in wood…
…you'd need a sharp hand tool, patience and skill. It was traditionally done with a carving gouge or an adze, as seen in this photo:
Image: Wrath of Gnon
However, woodworker Takurou Seino (whose clever bowl we looked at here) has created a jig that allows you to do it with a trim router and a bowl bit.
By attaching an optional parallel guide, you can introduce a regularity to the pattern that would be impossible to achieve with hand tools:
Here you can see how Seino made the jig, or you can skip to the last quarter of the video to see how he uses it:
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Seino has patented the design, and sells the jig for ¥6,000 (USD $41). Adding the parallel guide boosts the price to ¥9,600 (USD $65).
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Comments
Looks perfect and thus very wrong. Or I could say that he has invented a tool for mass production (relatively) and it looks that way. Every piece is going to be the same and that is just so far outside of the aesthetic of traditional, handcrafted pieces that it removes all dignity and most of the beauty. Or at least, it creates a new beauty of symmetric and perfection that is to me at odds with what he's imitating. .
Did you watch the video? After assembling his jig he uses without a guide to create irregular patterns in a couple of work pieces. They don't scream 'mass produced' even if the consistent depth could conceivably be spotted by someone skilled in the art.