The Optimist Conspectus: a compendium of contemporary optimism:
I can think of no divining rod more aptly suited to sussing out the nature of an individual than the measure of his or her optimism. In the answer lie clues to values, aspirations and fears rarely revealed through questions of a more direct nature.Ian Fitzpatrick, March, 2009
By the same measure, the picture painted by our collective optimism is a dense and revealing one; a view of those things to which we commonly aspire, and a glimpse into the distinctions between us - which are quite often far different than those purported to exist.
(You can submit your own reasons for optimism here.)