nontruth

To know when a truth will do is admirable, since no nontruth can be presented with the same sincerity.

In this particular play, the borderline between truth and nontruth, between imagination and reality, between illusion and reality, should be removed, and its borders mixed up.

What you get is a mixture of "truth and nontruth," he said, something that was not there before the film began but something that is undeniably there once the film is running.