I don't think it's possible to force your brain to see it one way or another. I did see it as white and gold once but it was only for a split second and only after staring at it for a long time. One of my friends tried to prove it was white and gold by messing with the white balance in Photoshop, but that did nothing for me. I'd be surprised if it worked by just covering parts of the picture, it might be a more external lighting perception trick.