Transformation of things

Once, Zhuangzi dreamt that he was a butterfly – flitting and fluttering around, happy with himself, doing as he pleased…
He didn’t know he was Zhuangzi.

Suddenly he woke up.
And there he was. Solid, unmistakably, Zhuangzi.

Yet he wondered:
“Did I just dream I was a butterfly? Or am I just the dream of a butterfly now?”