<Li> Unity of action: a play should have one main action that it follows, with no or few subplots . </Li> <Li> Unity of place: a play should cover a single physical space and should not attempt to compress geography, nor should the stage represent more than one place . </Li> <Li> Unity of time: the action in a play should take place over no more than 24 hours . </Li> <P> Aristotle asserted that a play must be complete and whole, in other words, it must have unity, i.e. a beginning, a middle and an end . The philosopher also asserted that the action of epic poetry and tragedy differ in length, "because in tragedy every effort is made for it to take place in one revolution of the sun, while the epic is unlimited in time ." </P>

What is a scene in ancient greek tragedy called