What is the theme in The Unbearable Lightness of Being by Milan Kundera?

Another theme in the book is politics and government. The Unbearable Lightness of Being is a political novel. It not only describes politics within the Soviet bloc, it takes as its subject political and governmental oppression. None of the characters in the book can escape from the tentacles of totalitarianism that threaten to strangle each one. When Tomas, for example, during the brief Prague Spring writes an essay critical of the Communist Party, he opens himself to a series of damaging responses.