Nagging Zen Saying

Some weeks back, there was this saying keeping playing in my head, but I can't recall the whole thing directly. Somehow I remember some words of it but the whole thing evades me. The thing is that it disturbs me like if you can imagine, you are seeing a fairy but somehow, you can't catch it because just at the right moment, she flies away. Would not it be nice if you can put a fairy in a bottle or aquarium and make it like a display thing. One that looks like Julia Roberts will be fine.

Oh the saying was this :

Chuang Tze, a Chinese philosopher, once dreamt that he was a butterfly. On waking, he said to himself, "Now, am I a man dreaming that I am a butterfly, or am I a butterfly that thinks, ‘I am Chuang?’"

May be it's not Zen at all, maybe it's Chinese ... or rojak. I could have a nice plate of mee rojak now. In my real state; not dreams.