With Constrained Ball, No Ruler Is Needed.

Constrained Ball is a cool drawing aid for those who need to draw straight lines again and again and need a pixel perfect measurement for each of the line. The Constrained Ball drawing aid will let you attached to your pen, and the device has been equipped with a high-sensitive roller that will measure the length of the line drawn with the pen, and help designer to draw straight line easier.


Constrained Ball Drawing aid is a concept design by Korean designer Giha Woo. It looks like the device has already existed, but no idea if the digit-display is a dummy or real.




[via DesignBoom]

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