Eyes closed,you can see with your mind as film,a wide range of themes(topics,issues, incidents,etc)All justling,tugging for attention.
However,as an unexposed film in a camera remains blank until the photographer sees an object of interest and decides to squeeze the shutter-trigger,the screen writer must choose from a range of themes that permeate his mind.
Contemplate, then decide resolutely,the theme on which your screenplay dwells(NOTE-i did not say dwell)Interpret the theme until it blossoms into a human question.
To avoid ambiguity,let me illustrate what i mean.You may have observed termites as they co-exist in their colony:the drones,the workers,the queen etc.Your observations remain the experience of termites, until you relate them to the human condiion.
Imagine how it is status-quo in the termite-dom,the queen does nothing,has to be carried from one point to the other.Think!Does this not easily come-off as oppression?Well,that is on a level,the human experience is on another.It is notable in what Karl Marx identified as Bouigoise or Class System,which places people in social classes without consent,unjustly.That is the human condition.Your condition?
How about another level.Study of the history of termites,reveals that,the queen is also related to the other species of termites;in the sense that, she is the oldest member of that colony.In other words,she layed the eggs, that hatched them all.How far you can see on this level,determines the thrust and depth of your screenplay.The drones,the workers,the hewers of wood,the drawers of water,on the one hand,paying back what is due to the queen and the creme de la creme,on the other hand?
well, that is a termite point of view.
Humanly speaking,consider mother-nature,how it is that all men are born equal but not treated so,by the antecedents of our lives.Could you wonder if mother-nature can be said to be a particular human being?Good!Obviously not so,it is a symbolic picture,borne out of relating the experience of termites to that of human beings