《周礼·冬官考工记·磬氏&车人》
凡在笋虞上刻饰善于捕杀抓咬的兽类，一定要深藏它的爪，突出它的眼，张起它的鳞与颊毛。
凡攫閷援之类，必深其爪，出其目，作其鳞之而。
All those who engrave beasts that are good at killing and biting on the Shunyu must have their claws hidden, their eyes protruding, and their scales and cheeks raised.