Vertical Blue

Vertical blue is a color that you can see straight up and down. It's like when you look at a wall and the color goes from the floor all the way up to the ceiling. Sometimes people use vertical blue to paint on walls, or to make pictures or patterns. It's called "vertical" because it goes up and down instead of side to side. And it's called "blue" because it looks like the color blue. Just like how you might have a blue shirt or a blue toy, vertical blue is a shade of blue that you can see going up and down.