He decided it would be cool to make Reuleux triangle-shaped potholders. These are constant width, which seems like a nice feature, but the points give a nice place for the thumb, with the opposite side flatter for the fingers.
Sharon had to add extra lines beyond the basic triangle because there wasn't enough lines to properly hold the layers together.
Finally, the next day they are finished with true bias tape, made with just one seam. The points are sometimes still a little wonky due to the tight turn, but they're much better!
Here is the new potholder in action...