In his novel, Curtains of Darkness, Walid Al-Hodali explains the methods of psychological torture in Israeli prisons. Israeli torture masters have devised many means to oppress prisoners, break their hearts, and destroy their morale.
The phenomenon of birds prompted prisoners to remain silent for a long time, at a time when people need friendship, friendliness, and conversation with others. The Israeli occupation has also increased its use of the bird phenomenon, by placing spies inside the prisons who claimed to belong to the resistance.