I don't think this expresses the problem accurately. Something like facebook is "obvious on retrospect" in the sense that lots of people could theoretically hav

I don't think this expresses the problem accurately. Something like facebook is "obvious on retrospect" in the sense that lots of people could theoretically have built a similar site if they just had the idea and the right timing, but didn't so so. A lot of modern art I've seen maintains the "lots of people could do that relatively easily" aspect, but it doesn't have the "if someone else had built the same thing, I can see how it would have succeeded." Ie it's easy in retrospect, but it's not obvious. My personal take on it is just that a lot of it is basically nonsense / garbage, but perhaps I'm just cynical and closeminded.