Summary I do quite a bit of writing during the week. This tool helps to keep things organized by encouraging the use of a different color pen every day. This design is set up for the Pilot-G2 Pens. The holes are labeled MON, TUE, ... for each day of the week. When used consistently, you can look at materials you've written and it will trigger the realization that "Oh, I wrote that on Tuesday." How I Designed This Designed in Microsoft 3D Builder For something simple like this, 3D Builder was well up to the task.