Please don't beat me for bringing some dumb puffed-up internet meme to PF. Seriously, this is embarrassing. But fascinating. (I'm posting this in biology because I'm certain it is a colour perception issue.) Maybe you have seen this by now. http://digg.com/2015/what-color-is-this-dress I didn't think anything of it and was about to skip past it. But I showed my wife, and I was gobsmacked to find that she and I had exactly opposite views and had very strong feelings about it. I would not have believed there was anything interesting to this if I hadn't had the very thing happen in my own living room. Great. Now I'm having the same argument at work.