Why were modern artists taking these new approaches?

Throughout this unit we studied works that abandoned nearly all established traditions of art making. They were sometimes difficult to understand or even outright shocking. Why were modern artists taking these new approaches? Take one example from each section to compose your answer. No more than 250 words

Section1
Umerto Boccioni, Unique forms of continuity in space
Giaacomo Balla, Dynamism of a dog on a Leash
Marcel Duchamp, Nude descending a staircase
Hugo Ball, reciting the sound poem Karawane
Marcel Duchamp, L.H.O.O.Q.
Marcel Duchamp, signed R.Mutt, Fountain
Raoul Hausmann, Mechanical Head (spirit of the age)
Hannah Hoch, cut with the kitchen knife Dada through the last Weimar Beer Belly cultural Epoch of Germany
Max Ernst, Two children are threatened by a nightingale
Meret Oppenheim, object
Joan Miro, Person throwing a stone at a bird
Salvador Dali, apparition of face and fruit dish on a beach
Leonora Carrington, self portrait
Diego Rivera, the history of Mexico

Section2
Andre Derain, the pool of London
Henri Matisse, Portrait of Madame Matisse, the green line
Henri Matisse, the red studio
Pablo Picasso, Les Demoiselles d’Avignon
Georges Braque, the portuguese
Juan Gris, Bottle of Banyuls
Pablo Picasso, Guitar
Pablo Picasso, Three musicians
Erich Heckel, two men at a table
Ernst Ludwig Kirchner, self portrait as a soldier
Still from the cabinet of Dr.Caligari
Gabriele Munter, house in Schwabing
Vasily Kandinsky, Composition VI
Sonia Delaunay, Prose of the Trans Siberian and of little Jehane of France

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