What your termites should have done was to follow the lines that you drew with a Papermate or Bic ballpoint pen . . . pretty smart, aren't they?!  Actually, you have a secret that they haven't figured out yet!  In the wild, termites leave a scent trail so that they can follow each other and find a good place to start a colony.  The things that leave the scent trails are called pheremones.  And in your pens is a smell that is similar to the termite's phermones, so they actually think they are headed for their colony!  Now how smart do you think they are?!