Concave-Convex
The tenon and mortise building blocks are 211 pieces in total, extracted from the traditional Chinese tenon and mortise structure and simplified into 30 simple tenons and mortises (such as square dovetail, T-shaped tenon, etc.) suitable for young children to play. The tenon and mortise are made of dark black walnut wood and light beech wood, respectively. The natural color and simple wood sense make children feel the power of nature in play, and learn the wisdom of the ancients.
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