The overall geometry is borrowed from the solid wood frame chair in my kindergarten 20 years ago, and the shape of the backplane is derived from jigsaw puzzles, a popular game among children. 

Instead of hidden joints with hardwares or mortise and tenon, all connections bewteen components are directly penetrating through and fix with wedges, showing a unique plug-in style and catering to the puzzle theme.

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The assembly sequence is relatively simple, giving the children an opportunity to exercise their little arms and brains.