The names of the artists who created the pieces were also written in blue ball point pen on the wall. (en.wikipedia.org)
It featured over 500 drawings of distinct flowers, each rendered in black or blue ball point ink on folded or opened up paper napkins. (bombmagazine.org)
Kids will chew on their hair, on the edges of their notebooks, and on ball point pens they found on the floor. (educationworld.com)