When you look at the picture below, do you see straight or curved lines? That's the debate triggered by the viral optical illusion that's now raging on social media. The image is an eight-by-eight ...

There are two sorts of lines that are used to make shapes. These are curved lines. These are straight lines. A two-dimensional or 2D shape is made up of lines. Sometimes the lines are curved and ...

When you look at the picture below, do you see straight or curved lines? That's the debate triggered by the viral optical illusion that's now raging on social media. The image is an eight-by-eight ...