Here’s a fun trick – but be forewarned – it’s gonna freak you out.
Stare at the red dot on the woman's nose for 30 seconds. Then look at a blank wall and blink repeatedly. Whoa! Sit back down and calm your heart. It's only science (see explanation below). This optical illusion uses a negative image of a woman's head. If you stare at the dots for about 15 seconds, then look at a blank wall, you'll see a full-color image of the same picture (well, at least most people will see it. Those with cosmic superhero eyes will just see right through the wall). Why does this happen? This illusion is known as a negative afterimage. Our eyes have cone cells called ganglion cells that help us see pairs of primary colors. We have channels in our eyes for black