The traditional Japanese hake brush is made by partially splitting a single piece of wood, inserting the bristles into the split, and binding it tight with wire. It’s essentially what you’d come up with if you lacked the ability to manufacture ferrules, but had plenty of wire.
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The unusual legs of this Bik Stool, made of Oak, takes inspiration from hake brushes:
The stools are by London-based furniture designer Conor Hacon, a/k/a Common Design.
Source: core77