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Castles were built with military defense primarily in mind. Just because they were not constantly involved in siege does not negate that -- take the aircraft carrier example. Because it is a strong military defense, it doesn't often need to be used for that.

You can see hundreds of architectural decisions that were made with military aims -- some of them didn't work, and some of them weren't used.

But, whether staircases were made with the righthanded swordsman in mind is irrelevant. They were created with right-handedness in mind. Because of the placement of railings.




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