When I was in school, girls would put teethmarks all over their pencils, while boys would chip off the paint with fingernails. Those of us who carried pocket knives for sharpening pencils (most of us) might also carve out rings and spirals when we were bored. We had nothing on these guys though.
Ball joint pencil:
Just one hiccup could destroy a carving in progress. The photos are from a 1990′s Japanese exhibition by Kato Jado and Mizuta Tasogare, titled “The JAD Project”. Unfortunately, the website is limited in English descriptions, but the photos speak loudly…
My favorite – all from the same Ticonderoga H pencil:
A Six-fold spiral pencil: