The 20th century's most popular non-realistic genre is absurdism. In the Absurdist school of drama this holds true. Existence is fragmented, pointless. There is no truth so the search for truth is abandoned in Absurdist works.
Language is reduced to a bantering game where words obfuscate rather illucidate the truth.
Action moves outside of the realm of causality to chaos. Absurdists minimalize the sense of place. Characters are forced to move in an incomprehensible, void-like realm. This style of theater takes on the existentialist view of the world. His application of the term realted it to, what he considered, the incomprehensiblity and unjustifiability of Christianity.