《徐霞客游记·粤西游日记三十八》
远望过去洞中深黑，当地人在洞中祭祀神像，所以把它称为 鬼 。
洞中遥望杳黑，土人祀神像于其间，故谓之 鬼 。
Looking at it from far away the interior of the cave was pitch black, locals would offer sacrifices to statues in the cave, so they called it ghost.