A Chinese puzzle ball, sometimes known as a devil's work ball (Chinese: 鬼工球; pinyin: guǐ gōng qiú) or the Concentric Ball (Chinese: 同心球; pinyin: tóng xīn qiú), is an artifact that consists of a number of intricately carved concentric hollow spheres carved from a single solid block that fit within one another in a way that looks impossible, often consisting of fourteen layers. They were traditionally made of ivory.
A Chinese puzzle ball, sometimes known as a devil's work ball (Chinese: 鬼工球; pinyin: guǐ gōng qiú) or the Concentric Ball (Chinese: 同心球; pinyin: tóng xīn qiú), is an artifact that consists of a number of intricately carved concentric hollow spheres carved from a single solid block that fit within one another in a way that looks impossible, often consisting of fourteen layers. They were traditionally made of ivory.
Source: Wikipedia "Chinese puzzle ball" · CC BY-SA 4.0
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