Giha Woo, a Korean product designer creates a drawing aid called 'constrained ball'. Once attached to the pen, this device helps to draw straight lines without using a ruler. Normally, a ball point pen rolls freely in accordance with the ball located at the tip of the pen. However, this writing tool prevents winding lines by helping to move the ball in one direction only. Using the installed measuring wheel indicated on the product, users can draw the exact desired line length in both a horizontal and vertical direction, as well as strokes in 45 degree angles.
Let’s draw a straight line with the ball restricted in its direction. The length of the line can be measured accurately by calculating the turns of the wheel. Also, the accurate dimension of the straight line can be made as it is wanted. It is easy for fixing the inserted pen because the hole part is made of rubber in high elasticity. We can underline on the book and make a table and straight line in desired length can be drawn. [via]
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