The dress is a chameleon. I saw it last night on the news and on my phone and it was white and gold every time. I opened this thread this morning and now its black and blue. I went to a meeting and came back to my laptop and this thread was still open. Well, the first pic (Toolies) was now white and gold but perseco's was still black and blue. I scrolled back up to Toolie's and I watched it turn back to black and blue.
Not kidding.
We don't see things, we see light reflecting off of things so I think its just a matter of the amount of exposure in the pic itself and screen settings that is causing the different perceptions in the brain at any given time or display.
I saw one explanation that said it depends on a person's mood as to which color they will see. Good mood - white and gold Bad mood/upset - blue and black.