Take a look at http://insearchofthetruth.net/ . How to characterize this? A road show, performance art with unlimited actors or psychological research? A group of artists built this thing that looks like a cartoon speech balloon. There is a video booth behind the curtain, in which visitors are asked to spend two minutes stating what truth means to them. It has gone around much of the world, visiting Afghanistan before St. Louis, where it stopped in front of the main branch of the public library.
It's a fascinating idea. You can see and hear many of the participants on its website. I gave it a shot, prattling on about the scientific method and the subjectivity of of consciousness. If you care to, give us your definition in a comment.