Leonardo grids: structures built with only one rule

Leonardo Grids are a system of construction using linear elements (beams) with a single placement rule. This system is sufficient to construct domes. Modify the basic element to be curved and you can create spheres, cubes, and other polygons.

Bridges Conference Proceedings Guidelines: "Leonardo grids is the name I gave to my bar grid construction system with which I was able to construct domes and spheres out of simple elements using one constructing rule. Most of the constructions I made where planar and static."

(via Reddit)