One closed solution to the n-body problem. A set of bodies at the points of a regular polygon, alternating heavier and lighter bodies in a regular pattern. Each is given an angular momentum around the center to keep them in an unstable equilibrium.
Incorrectly referred to as a "Kemplerer rosette", the Pierson's Puppeteers keep their "Fleet of Worlds" in a pentagonal configuration. Technically this solution to the n-body problem was worked out before Klemperer's paper.