THROWBACK THURSDAY - "I wonder if this would work for a color blind person...?"

(originally published on October 9, 2012)

Okay, you look at the negative image, and then after 30 seconds or so, the photo of a plaza will appear . Even though the plaza you see is gray-scaled (black and white), your eyes are tricked and image looks like it’s in full-color (until you move your eyes)


Here's another one...

Okay, I understand the science behind this, but it always sort of creeps me out... 



(via)