[grimalkin]

The Portuguese have a word for this called Saudade.

http://en.wikipedia.org/wiki/Saudade

Saudade has been described as a "vague and constant desire for something that does not and probably cannot exist ... a turning towards the past or towards the future".

Different things trigger it for me: smells, impressions, sounds, sights like birds, empty fields, sunsets, & open spaces.

Sounds like a cool project.

[Winstons Julia]

http://en.wikipedia.org/wiki/Fado

http://www.youtube.com/watch?v=ARS7Zi-Zpkw