I developed these panels in response to part 1 of the Polypanels Design and Print competition. I focused my attention on "what's missing" from the Polypanel universe.

After printing a pile of Polypanels in several colors, I started playing with the pieces, building a variety of models and shapes, and I was impressed with the flexibility of these simple four basic shapes, and didn't see an obvious answer to the question. I was too focused on the specific shapes, and not on the system itself.

I spread the printed Polypanels out in front of me to get a look at the bigger picture. It occurred to me that the pile in front of me resembled an unmade puzzle. Again, I asked myself "what's missing"? It hit me. Edges. When you make a puzzle, where do you start? At the edges. These are all interior pieces. I decided to make edges.

This started out as a few rectangular pieces that could be used to put a nice edge on a design, but I discovered that there were a few edge pieces already out there, so I evolved these into a more complete taxonomy of rectangular edge pieces. The "A" series simply replaces the square when used in a finished edge situation. The "B" series is a single-hinge variant, with the width of the panel centered around the hinge centerline. The "C" series was devised because the hinge geometry makes the "B" series more than half a panel wide, and I wanted something that could be used for a door or shutters, or other half-panel needs. The "D" panels coordinate with the "C", but are square, and the "E" panels are pure edges, back where I started.

Although these panels were devised to work primarily with square Polypanels, they will fit the other panels as well, of course. I am, however, working on another series specifically to deal with the other variants, and a round edge series so that you can make squares (and other shapes) into circles and other rounded forms. Those, however, are beyond the scope of this submission.