《天工开物·下篇·珠玉》
白天天气晴朗的时候，在屋檐下能看见它有一线光芒闪烁不定， 夜光 只不过是对它的赞美之辞，并不是真的能在黑夜中发光。
白昼晴明，檐下看有光一线闪烁不定， 夜光 乃其美号，非真有昏夜放光之珠也。
During the clear days, you will see a line of light flickering under the eaves, and the night light is just a term of praise and does not really glow in the dark.