Optical illusions are great because they teach ... Try to focus on the numbers instead of the distracting black and white lines, which may attempt to distract your vision. What number do you ...

But on closer inspection, the students are actually covered in streaks of red ... is a black and white photograph with colored criss-crossed lines overlayed. This isn't an optical illusion ...

An optical illusion is being circulated on social media that has left netizens scratching their heads. Many netizens said that they see different numbers. While some users said they could see all ...