Haven't we been here before?

A picture of this Kate Spade bag was posted on Twitter.

When someone mentioned it was white (see below), that opened the flood gates of people chiming in with what they felt was the bag's color, even though the purse's owner says Kate Spade claims it's "mystic blue."

After that, a debate not seen since #TheDress followed. So, we ask: is it blue or is it white? Or are you seeing something else entirely?