Silverstein, S: Missing Piece

It was missing a piece.
And it was not happy.
So it set off in search
of its missing piece.
And as it rolled
it sang this song -

Oh I'm lookin' for my missin' piece
I'm lookin' for my missin' piece
Hi-dee-ho, here I go,
Lookin' for my missin' piece.

What it finds on its search for the missing piece is simply and touchingly told in this fable that gently probes the nature of quest and fulfillment.