Chapter 12, Part 4 - Chuang Tzu

The Yellow Emperor went wandering north of the Red Water, ascended the slopes of K'un-lun, and gazed south. When he got home, he discovered he had lost his Dark Pearl. He sent Knowledge to look for it, but Knowledge couldn't find it. He sent the keen-eyed Li Chu to look for it, but Li Chu couldn't find it. He sent Wrangling Debate to look for it, but Wrangling Debate couldn't find it. At last he tried employing Shapeless, and Shapeless found it.

The Yellow Emperor said, "How odd! - in the end it was Shapeless who was able to find it!"
~ Burton Watson translation via Terebess Asia Online ~

Go here to read the introductory post to the chapters of the Book of Chuang Tzu.