Hey, I found that famous part in Chuang Tsu/Zhuang Zi/荘子 where the guy can't tell if he's a butterfly or not. Here's what it looks like in my edition, modernising characters here and there, plus my translation (courtesy of the notes in the book):

昔者、荘周夢為胡蝶、栩栩然胡蝶也、自喩適志与、不知周也、俄然覚、則遽遽然周也、不知周之夢為胡蝶与、胡蝶之夢為周与、周与胡蝶、則必有分矣、此之謂物化。
Long ago, Zhang Zhou dreamed he was a butterfly. A flippity flappity butterfly, having a grand old time and knowing nothing about Zhou. But when he woke up he was immediately back to being Zhou again, plonkety thud. Now, we can't say whether Zhou dreamed that he'd become a butterfly or the butterfly dreamed that it had become Zhou -- but they are, nevertheless, different entities. This is called "things changing" (物化).

(Zhang Zhou was Zhuang Zi's "real" name.)

I suspect that there's a technical meaning of 物化 that would illuminate this passage more, but I'm not that familiar with Zhuang Zi. Anyone?