"Modernism" is a set of cultural, artistic, intellectual and social norms and developments that have been prevalent in the first few decades of the twentieth century. The exact dates that span the modernist movement are debatable, but they are not too relevant for the purposes of understanding what are considered its greatest achievements. This very short introduction focuses on the cultural developments roughly between 1909 and 1939, although many works that predate these years have had strong modernist characteristics. The book also doesn't deal much with the social, political and religious ramifications of modernism, although it acknowledges modernism has had a very strong interplay with the historical developments.
The three main cultural developments that the book focuses on are literature, painting, and music. The book brings alive one of the most intriguing and exciting periods in the history of art and literature. It discusses works by Pablo Picasso, James Joyce, T.S. Elliot, Virginia Woolf, Igor Stravinsky, and many others. The reader learns about the techniques that had been used in creating some of the modernist masterpieces, as well as the motivation behind those particular techniques. The book is extremely interesting to read, and makes one want to pick up a book by Joyce, take a look at a Dali painting, or listen to a Schoenberg piece. This introduction goes a long way in presenting those works of art in an accessible way, without being too pedestrian. It is one of the more inspiring books in the "Very Short Introduction" series.