I spent so long trying to make myself see blue-and-black. Kind of resigned that I can’t do it.

I’ve managed to game other optical illusions by covering bits of them up, to break the effect, and then slowly shift the amount covered. Cover one eye. Focus on one part of the image.

I can make the Necker cube be in either orientation.

I’ve seen The Spinning Dancer run in both directions.

But The Dress remains determinedly white-and-gold.