Labour is blossoming or dancing where
The body is not bruised to pleasure soul.
Nor beauty born out of its own despair,
Nor blear-eyed wisdom out of midnight oil.
O chestnut-tree, great-rooted blossomer,
Are you the leaf, the blossom or the bole?
O body swayed to music, O brightening glance,
How can we know the dancer from the dance?
–William Butler Yeats, Among School Children
(There is another appropriate poem, by Cynthia Claire Allen, that I might put up here, but I would have to get permission.)