When the green woods laugh with the voice of joy
And the dimpling stream runs laughing by
When the air does laugh with our merry wit
And the green hill laughs with the noise of it
When the meadows laugh with lively green
And the grasshopper laughs in the merry scene
When Mary and Susan and Emily
With their sweet round mouths sing "Ha, ha he!"
When the painted birds laugh in the shade
Where our table with cherries and nuts is spread
Come live, and be merry, and join with me
To sing the sweet chorus of "Ha, ha, he!"
That the birds are ‘painted’ is a metaphor that suggests bright colours, but also the possibility of a higher power that is responsible for their creation. 
 The  Romantic poets , notably Blake, Shelley and Wordsworth, wrote poetry in praise of nature. Keats'  Ode to a Nightingale , and Shelley’s  To a Skylark  are examples. Blake, however, places his depiction within the Pastoral tradition.
Laughing Song