Some interesting explanations of trying to write down the the things you can't put into words. Makes you look at the limitations of words to capture everything. And at the same time, you notice how every language has words that encapsulate more than can be translated and that are sometimes tied to culture-specific ideas.
http://en.wikipedia.org/wiki/Saudade
http://en.wikipedia.org/wiki/Sehnsucht_%28C._S._Lewis%29
When I was a child I caught a fleeting glimpse,
Out of the corner of my eye.
I turned to look but it was gone.
I cannot put my finger on it now.
The child is grown, the dream is gone.