Here is a cool corner joint that goes together 3 ways (straight or at a right angle in multiple ways). The design is based on the rotational symmetry of a cube. The below video provides more information on this joint:
More gadgets like this: here
Clever 3-way joint (Kawai Tsugite) explained
As it is explained here, this may not be a useful woodworking joint. It is still a fun project to try though.
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