2个叠出来的分别是可动结构，给两个嵌套创造了一个可动的狭小空间，利用卯榫原理，将它俩挤实一体更坚固了。
The two stacked structures are movable structures, creating a small and movable space for the two nested structures. By using the mortise and tenon principle, the two are squeezed together to make them more sturdy.
The two stacked structures are movable structures, creating a small and movable space for the two nested structures. By using the mortise and tenon principle, the two are squeezed together to make them more sturdy.
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Abstract
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Artistic
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