What color is this dress?

[True Federalist (진정한 연방 주의자)]

Light blue and dark gold, which suggests my screen doesn't have as much contrast as those who see it as black and white.  That people are seeing it differently on different screens is no real surprise.  Even in real life actual objects appear different in different light conditions.  My girlfriend has this brown sweater that looks purple in low light conditions.  It's not at all unusual for things to look different under fluorescent and incandescent lights, let alone sunlight.

[True Federalist (진정한 연방 주의자)]

Looks like this dress has attracted the notice of xkcd: http://xkcd.com/1492/

[True Federalist (진정한 연방 주의자)]

At first I saw white and gold, then changed to blue and gold. I don't understand how anyone sees blue and black.

I saw and still see blue and gold.  I can understand how some would see it as blue and black, but I'm baffled by those who see white and gold.