Unranked Joinery
Contested Centers
Cambridge, MA
MIT, Geometric Disciplines
Instructor: J. Jih
Collaborators: Ginevra D’Agostino, Jinyoung Sim, Zhifei Xu
How can we design joinery without hierarchy?
Traditions of woodworking joinery utilize a two-part system, often positive/negative or major-minor. In this exercise, we explore a geometry where each discrete part of the whole challenges the order of the system. Though each unit expresses unique material and tectonic qualities, they offer equivalent performance in combination.
![](https://freight.cargo.site/t/original/i/398cb2d41980f71ab53bd845b2a8ecd043c1473dba88604ce3987b8aed1fffee/WebThumbnails_Fulcrum.jpg)
Milled Basswood Joinery
![](https://freight.cargo.site/t/original/i/6762c63eac16c0888e6a225c622612f8271c6b77bfbd014c4abf5c2c1e245f19/Web_FulcrumSquareComposition.gif)
![](https://freight.cargo.site/t/original/i/aab404bea3ffbbb42b826a4d03906847a100800b7d9fcada482185f2a82c4e19/Web_Fulcrum_Unrolled.jpg)
![](https://freight.cargo.site/t/original/i/b64f919e1c614e8def6e73b4fdebde4469805469f3096bd1bb7c67816407c6c3/Web_FulcrumDiagrams_ContestedCenters.jpg)
![](https://freight.cargo.site/t/original/i/bef41abff577251106db5809a2fc6e5de0949b2a1f6f7a441410a6c8c1aca33d/Web_FulcrumDiagrams_Helical-Assembly.jpg)
A 45 degree helix surface splits and redistributes each form, dissolving hierarchy among the four members but maintaining the orientation about the central pivot.
![](https://freight.cargo.site/t/original/i/d44c0b0789a9b76fea5408075f57f4c792d16d5914d045f439adc857f3d03079/Web_Fulcrum01.jpg)
The four members are aggregate in order of mass, meaning the heaviest anchors the assembly and gives orientation to the sphere.
![](https://freight.cargo.site/t/original/i/fde5849c260c6a277bf45cdb6d2bee49fe9855fe18638b071ea3f9a68bd912e3/Web_Fulcrum02.jpg)
As the assembly is materialized, new graphics emerge from the projection of wood grain orientation across geometric intersections.
![](https://freight.cargo.site/t/original/i/5b95fd4475b5c59140d7612a74e6ad21cde8f5db7eead24c02c0881ec75b47aa/Web_Fulcrum03.jpg)
Though the internal mechanical joinery is distinct in each of the four pieces, the set reads as a family due to the external spherical form.
![](https://freight.cargo.site/t/original/i/506274be9ad1e019502df88e39a700c678cd5b348d45a8bc43e8c59b52f5e673/Web_Fulcrum04.jpg)
The infinitesimal tangency between two spheres yields during machining, leaving a circular notch: an analog remnant of the 3/4” diameter routing bit.