A proportioning load device adjusts rear brake force to different loads. EBD reduces the strain on the hydraulic brake force proportioning valve in the vehicle. Two classic mechanical examples are the toilet bowl float proportioning valve and the fly-ball governor. This torque splitting/proportioning device is patented as "Split-Diff". Dynamic symmetry is a proportioning system and natural design methodology described in Hambidge's books. This method of mix proportioning is especially popular when producing high-strength concrete and fiber-reinforced concrete. An authentic kachina figure will have proper proportioning of the body and no excessive detail. The vesica piscis is also used as proportioning system in architecture, in particular Gothic architecture. This included books about the modulor system of proportioning. They are predominantly human figures drawn in fine detail with accurate anatomical proportioning.