2. Stare at the cross. What’s wrong with these celebrities’ faces?
5. Stare at this video for 45 seconds, then look at your palm.
8. This floor is completely flat.
9. Stare at the black cross for 10 seconds and see what happens.
The purple dots disappear! When one fixates on a particular point for even a short period of time, an unchanging stimulus away from the fixation point will fade away and disappear.
10. These monsters are the exact same size.
11. The squares marked A and B are the same shade of gray.
12. Is this photo in black and white, or color?
13. What’s happening here?
14. The spirals that appear blue and green are actually the same color.
The reason why we are perceiving one color as two different colors is because of the other colors surrounding the stripes.
Each eye has six to seven million cones, which are concentrated in a central yellow spot known as the macula. These cones measure color in different wavelengths, where some of which overlap. Our brain then compares by measuring the differences in wavelengths between the colors. When certain colors are combined, the brain can’t process the data from the cones correctly and we get confused.
15. Stare at the colored dots on the girl’s nose in the photo above for 30 seconds. Then look at a white surface and start blinking.
16. These two blocks are the same color.
Skeptical? Put your index finger over the line where the two boxes meet.
17. Try to focus on one of the dots.
If you keep your eyes on the black dots, they appear to form and vanish at the intersections of the horizonal and vertical lines. The effect is diminished if one is very close to the screen, further away or if one views at a 45 degree angle.
This illusion is known as the Scintillating grid.