《太平广记·卷二百二十七·伎巧三》
掘地二尺深，你可以找到一种东西，象琥珀。它就是虎的目光掉入地里所形成的虎威！
深二尺，当得物如琥珀，盖虎目光沦入地所为也。
Dig two feet underground, you will find something like amber. It is formed when the tiger's glare fell on the ground, and that is the tiger's energy!