Have you ever wondered to draw a straight line without the help of a ruler?. Here is an interesting instrument created by a korean product designer giha woo, which helps you to draw a line for a measured centimeters without using a ruler. The product is named as a “Constrained ball”, as the name goes a ball point pen rolls freely in accordance with the ball/wheel attached at the bottom of the pen. The users can set the exact desired line length in both a horizontal and vertical direction. Sound’s interesting right?, do you feel this instrument can help you to draw a straight line?
