How to draw a straight line without using a ruler : Constrained ball instrument!

Updated on September 1, 2017

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?

The ball point moves along with the constrained ball
The ball point moves along with the constrained ball

 

The ball point moves along with the constrained ball
The ball point moves along with the constrained ball

 

The ball point moves along with the constrained ball
The ball point moves along with the constrained ball

 

Insert the pen into the constrained ball
Insert the pen into the constrained ball

 

Have a look at the measure indicator at the top
Have a look at the measure indicator at the top

 

constrained ball roller
constrained ball roller

 

constrained ball
constrained ball

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