Here's a fun optical illusion for you to try.
Stare at the dots located at the center of the woman's face on the left for about 30 to 60 seconds. Then shift your vision to the blank white space to the right and blink quickly several times. What do you see?
Most people will see a full-color version of the negative photo. Learn more about how the illusion works in this overview of the negative photo illusion.
Image by geloo, modified by Kendra Cherry