The Magic Donkey finds this interesting....

said donkey is a computer algorithm that ranks every photo uploaded to Flickr . Naturally, the specifics are a closely guarded secret. Flickrphiles speculate as to what makes the Magic Donkey neigh. amount of traffic to a photo is surely a factor, but other than that, none of the general public seems to know, which keeps it honest. The algorithm determines interestingness, and seems to work really well. 500 pictures a day are put up on explore and they are for the most part, interesting, really. Check it out. The explore page will give you a fresh picture every time you reload, as well as a few other browsing options.

Sadly, I have never had an explored photo. The lady above is rated by the Magic Donkey as my most interesting...#1. I don't even know her name. This is my #4 photo

 Go figure. 

Anyhow, my own theory, is that a high volume of traffic traffic from unlogged visitors/non-members, goes a long way to upgrading interestingness (hint, hint)