That's because they are like the floor and roof of the house. Yet in a play worthy of Sam Shepard or Beckett these spices can reverse roles in the eternal courtship of call and response. Sometimes it is the salt calling hither and the pepper in repose. Other times the other way around. But they are always themselves.
Salt is never peppery nor pepper ever salty.
The greatest governors to ever preside over a table are color blind. Yet they color every taste. They are the spine, the illumination, the narrator, the judiciary and the jury to each taste on all buds. The election is over.