I think the novel design of the little hinge/interlocking bits are what was patented, but if the designer is the patent owner they can do whatever they want with it. Lots of pieces like this are made as portfolio pieces for the publicity or prestige of a design firm and not necessarily for profit-- “Check it out, we developed bespoke computer methods and a unique hinge system for a stool we’re giving away the plans for. Just think of what we could do if you commissioned us for actual money!” Chairs and stools are popular signature pieces for designers because they’re relatively simple, relatively cheap, easy to work with, and offer a huge blank canvas for style choices. Seriously, designers go nuts for things that fit butts.
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