Left and right sides, both as directions and hands, are not the same. When observing signs or when structuring a Temple as sacred space, left and right sides have different senses and meanings.
Left side is a propitious and favourable side while right side represents the "ability", "skills" (dexterity). Favourable signs thus usually appears in the left side and everything with propitiatory feature has to involve the left side.
According to a symbolic point of view (but also in architecture for example) the "Right Column" has to be identified with Peace, while the "Left Column" has to be identified with Justice and Severity. Similarly right hand is "the Blessing Hand" while the left hand is named "The Justice Hand".