You can file the Penblade Knife in the "why didn't I think of that" file. You should have — you'd be a millionaire like each and every member of the Penblade organization. The Penblade knife opens and retracts just like a ball point pen, so it's easy and intuitive to use. When not in use, the blade is hidden inside the body of the knife where it can't hurt anyone and it can't be damaged itself. The folks at Penblade soon discovered that the Penblade had many uses, and decided to market it to hobbyists and crafts-lovers — anybody who could use an ultra-sharp, ultra-precise cutting tool. Swarm produced a promotional informational video and 3D motion graphics. These now live on the Penblade website. They accurately showcase the Penblade's many uses for crafts-lovers, hobbyists, and non-medical types the world over.