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This design is originated from the basic concept that "Interlocking blocks join sheets of paper". The most important feature is that the convex part of the block is designed to punch paper.
The conventional way of joining sheets of paper needs a stapler and a staple.
If one of them is missing, you cannot join sheets of paper.
The staple is not reusable.
Punching block can join sheets of paper by interlocking blocks, and it is reusable.
The linking cloths of two bricks can be used as label, and you can put a pen in it.
Gyeongsan-si, South Korea
Sung hoon , Jung Jin young , Yoon Su jung , Lee