http://tinyurl.com/zhd9f5m Hidden clearance page at Tomtop.
Product link: http://www.tomtop.com/diy-kongming-wooden-lock-educational-assembly-puzzle-toy-together.html?aid=tomorrowtop SKU: T1028 [Price: $4.47] Kongming Lock, also called gossip lock, Luban Lock, is the ancient tradition of a fixed combination of civil engineering device, which originated in ancient China's first tenon joint construction of the structure. It is an intellectual toy, is given some gaps in the wood, it requires them to put together. This toy has some difficulties to play, because it is some of the geometry of the mosaic. You need to use the space for imagination, which plays such a toy, should be counted as math game. So it perfectly brings you up with some abilities.
