What are the motifs in The Unbearable Lightness of Being by Milan Kundera?

Kundera spends considerable energy to define, describe, and investigate the role of kitsch in communist society. "Kitsch" is a German word that loosely means inferior, sentimental, and/or vulgar art. Although kitsch claims to have an aesthetic purpose, it tends to simplify complicated ideas and thoughts into stereotypical and easily marketable forms. Kitsch appeals to the masses and to the lowest common denominator. It is the world of greeting-card poetry and velvet Elvis. For kitsch to be kitsch, it must be able to evoke an emotional response that according to the book "the multitudes can share."