The laws to which this type of tragedy sought to conform were not so much truth to nature as the principles which the critics had derived from a somewhat inadequate interpretation of Aristotle and of the practise of the Greek tragedians. These principles concentrated the interest of the play upon a single central situation, in order to emphasize which, subordinate characters and complicating under-plots were avoided as much as possible. There was little or no action upon the stage, and the events of the plot were narrated by messengers, or by the main characters in conversation with confidantes. Further, the "dramatic unities" of time and place, as well as of action, were held to be binding.