I stumbled across this beautiful poem on the internet by the Nigerian poet called Gabriel Okara. His book, 'The Voice,' has gone straight onto my to be read list. Anyways, here's the poem.
Once Upon a TimeOnce upon a time, son,
they used to laugh with their hearts
and laugh with their eyes:
but now they only laugh with their teeth,
while their ice-block-cold eyes
search behind my shadow.