What were decorative gourds like this used for during China's Tang Dynasty (618-907)?

Domesticating crickets was all the rage during the Tang Dynasty. Those who appreciated the cricket's chirping song wanted to keep the critters close by. But how to keep their beloved companions cozy during the cold winter months? Gourds, of course! Goopy guts removed, dried and lacquered, the squash became a perfect cocoon.

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