Arch Taking Turns [upd]: Subil

In architecture, an is a curved structural element designed to span an opening and support weight from above. Chicago Architecture Center Arch | Chicago Architecture Center

When weight is applied to the top of a true arch, the force is translated outward and downward along the curve of the structure. This force travels through the wedge-shaped stones known as , pushing them tightly together. The central stone at the very top, the keystone , is the final piece inserted. Though it often bears the least weight of any stone, it is the linchpin that locks the structure into a state of static equilibrium, forcing the adjoining stones to support one another. subil arch taking turns

In practice, “Subil Arch taking turns” means you rotate responsibilities in a predictable, repeating pattern that treats all participants equitably. In architecture, an is a curved structural element