Today’s invention is a way to make pencils so that when sharpened, they reveal a hidden message, or the frames of a comic strip.
A graphite core would be wrapped in tape in the shape of a helical strip (just like a continuous piece of sharpening).
This would have some message preprinted upon it, so that when inserted into a sharpener and turned, a precise thickness would be removed, corresponding exactly to the depth of the applied tape.
(This could be used to enliven eg promotional pencils by including a secret web address or even a joke).
