A symbol with diagonal lines dividing a red circle is often used to mean 'prohibited' or 'NG.' In addition to being seen on road signs in Japan, the United States Patent and Trademark Office (USPTO) ...

This optical illusion is a fairly simple one, but it’s still a very impressive effect. A triangle and some cunningly positioned diagonal lines are all that’s needed for your brain to tilt a perfect ...

Parallel lines are indicated by arrows going in the same direction. Parallel lines are indicated by arrows going in the same direction. If there is more than one set of parallel lines in a diagram, ...

In one, he evokes the image of Superman using just a red diagonal line on a blue background, simulating the superhero flying through the sky. And just one white line on a red background represents a ...

A square has two diagonals (lines that run from one corner to a different corner, but not between two corners on the same edge). For the four-number case, we can do 12 + 34 = 43 + 2 + 1. For the ...