If I had to characterize this art project, I’d say it was a manifestation of the universal human desire to get caught:
PostSecret is an ongoing community art project where people mail in their secrets anonymously on one side of a homemade postcard.
[…]
You are invited to anonymously contribute your secrets to PostSecret. Each secret can be a hope, regret, funny experience, unseen kindness, fantasy, belief, fear, betrayal, erotic desire, confession, or childhood humiliation. Reveal anything – as long as it is true and you have never shared it with anyone before.
There’s something innately profound about the sheer mundaneness of it all; just like the Thought Project I mentioned earlier. There’s also A PostSecret Book
(No, none of the postcards or emails there are mine. Seriously. I swear.)