What Draws People To Different Images?

I was looking around at ffffound today, and saw the picture below. It just jumped out at me as something that I really liked looking at. Then I noticed that only 3 people had saved it, as opposed to 27 or 56 people for other pictures that I didn't find as interesting. It got me thinking about why certain people are attracted to certain visual qualities and traits. Whenever I'm looking around at ffffound I just flip through and wait for something to jump out, grab my around the chest and start shaking.

I think that's what ffffound eventually wants to become, if I understand correctly; a place where people choose different images they respond to and eventually a commonly appreciated aesthetic thread is found in their options. Then ffffound can direct its users towards other images they may appreciate, based on similar criteria from their already established visual preferences.

It's a great idea, and I'd certainly want to be a part of that kind of experiment. I'd like to know why I'm not interested in looking at a picture of two green cars (where as 10 other people think it's interesting enough to download), but I think blue shipping crates and red flags are just the coolest.