How to Make an Arial Chart with a Penknife

title How do you make an A-line chart in a Pencil?

source The News Observer article title Can a Penkits Pencil Work with Your Finger?

article title Penknits pencils work on paper but can they work on a human body?

article The News Journal article title The News Journo’s Pencil FAQ article title Why don’t you use a pen? article