Early aircraft, up to World War 1 vintage, had the rudders in the ‘reverse’ sense. Probably came from horses and four wheeled carts, left end of bar moves forward and you go right. Makes sense when you think it through – but this meant crossing over the cables on their way to the rudder. After a series of accidents caused by mis-rigging the whole thing was simplified by running the left cable down the side of aircraft to the left side of the rudder and vice versa. Its obviously the norm now – but it is ‘unnatural’.