After small scale experiments with thin, non-corrugated, cardboard, I began to design a stool based on a cylindrical structure. At the small scale, this provided the most stable basis for my stool. It was at this point that I decided on the slotting mechanism that remains part of the final stool. This is a very simple joint that none the less creates a solid shape without removing much structural integrity, as some of the other joints I experimented with did. I considered a toothed joint for some time, but this was not as firm as the simple slot joint, was very time-consuming to produce precisely by hand. In addition, the jagged edge detracted visually from the generally clean, geometric lines of my stool.
However, once I started experimenting with the thicker cardboard, it became clear that a smooth circular shape was difficult to achieve and made internal support structures less effective. Therefore, as I did not want to revert to a square or rectangular shape for both aesthetic and practical reason, I settled on a hexagonal shape. This adds visual interest, and additionally provides load-bearing corners that help to keep the internal lattice in place.
Inside the stool is a crossed pair of boards that both help to bear the weight of the sitter, and help the hexagon maintain its shape and rigidity. I began experimenting with a section that did not extend all the way to the base of the stool, as my primary problem was keeping the hexagon shape in place, not with load bearing. This iteration, though able to hold my weight, did not feel particularly stable, so I added a second crosspiece and extended both to the ground.
In addition to the main slot joint, I also used tabs and ties (made from thin strips of cardboard). The tabs attach the internal lattice to the shell of the stool, thus enabling them to make the hexagon shape rigid. The ties attach to hexagonal seat of the stool to the main body, through holes cut into the internal shaping boards. I wanted to hide the joining mechanism as much as possible, for the sake of both aesthetics and comfort. Therefore, the two strips are understated on the seat, and do not disrupt the symmetry of the hexagonal shape, while the more technical aspect is hidden inside the body of the stool.
While designing and building my stool, I kept Sullivan’s declaration that ‘form ever follows function’ (Sullivan 1896) in mind. Every design decision I made was primarily to further the function of the stool, rather than for aesthetic reasons. Following this, I wanted the form to be as simple as possible, to use no unnecessary parts or ornament. Of course, the choice of shape was an aesthetic decision as well as a functional one, but the need to support weight as safely and as efficiently as possible was foremost in my mind.
References
Sullivan, L. 1896. The tall office building artistically considered. Lippincott's Magazine. 57(3), 406.







